# Eureka Lessons for 6th Grade Unit FIVE ~ Equations & Inequalities

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1 Eureka Lessons for 6th Grade Unit FIVE ~ Equations & Inequalities These 2 lessons can easily be taught in 2 class periods. If you like these lessons, please consider using other Eureka lessons as well. Challenges: Taking the time to read through these lessons before teaching. Worth it. Lesson 23 Pages 2-3 Informational Pages Pages 5-10 Teacher pages for True & False Number Sentences Pages Exit Ticket w/ solutions for Lesson 23 Page Student pages for Lesson 23 Pages Teacher pages for True & False Number Sentences Pages Exit Ticket w/ solutions for Page Student pages for

2 6 GRADE Mathematics Curriculum GRADE 6 MODULE 4 Topic G: Solving Equations 6.EE.B.5, 6.EE.B.6, 6.EE.B.7 Focus Standard: 6.EE.B.5 Understand solving an equation or inequality as a process of answering a question; which values from a specified set, if any, make the equation or inequality true? Use substitution to determine whether a given number in a specified set makes an equation or inequality true. 6.EE.B.6 Use variables to represent numbers and write expressions when solving a realworld or mathematical problem; understand that a variable can represent an unknown number, or, depending on the purpose at hand, any number in a specified set. 6.EE.B.7 Solve real-world and mathematical problems by writing and solving equations in the form xx + pp = qq and pppp = qq for cases in which pp, qq, and xx are all nonnegative rational numbers. Instructional Days: 7 Lessons 23 24: (P, P) 1 Lesson 25: Finding Solutions to Make Equations True (P) Lesson 26: One-Step Equations Addition and Subtraction (M) Lesson 27: One-Step Equations Multiplication and Division (E) Lesson 28: Two-Step Problems All Operations (M) Lesson 29: Multi-Step Problems All Operations (P) In Topic G, students move from identifying true and false number sentences to making true number sentences false and false number sentences true. In Lesson 23, students explain what equality and inequality symbols represent. They determine if a number sentence is true or false based on the equality or inequality symbol. 1 Lesson Structure Key: P-Problem Set Lesson, M-Modeling Cycle Lesson, E-Exploration Lesson, S-Socratic Lesson Topic G: Solving Equations 242

3 Topic G Symbol Meaning Example = Is equal to = 4.8 Is not equal to > Is greater than 1 > 0.9 < Is less than 1 4 < 1 2 In, students move to identifying a value or a set of values that makes number sentences true. They identify values that make a true sentence false. For example, students substitute 4 for the variable in xx + 12 = 14 to determine if the sentence is true or false. They note that when 4 is substituted for xx, the sum of xx + 12 is 16, which makes the sentence false because They change course in the lesson to find what they can do to make the sentence true. They ask themselves, What number must we add to 12 to find the sum of 14? By substituting 2 for xx, the sentence becomes true because xx + 12 = 14, = 14, and 14 = 14. They bridge this discovery to Lesson 25 where students understand that the solution of an equation is the value or values of the variable that makes the equation true. Students begin solving equations in Lesson 26. They use bar models or tape diagrams to depict an equation and apply previously learned properties of equality for addition and subtraction to solve the equation. Students check to determine if their solutions make the equation true. Given the equation 1 + aa = 6, students represent the equation with the following model: aa 6 Students recognize that the solution can also be found using properties of operations. They make connections to the model and determine that 1 + aa 1 = 6 1 and, ultimately, that aa = 5. Students represent two step and multi-step equations involving all operations with bar models or tape diagrams while continuing to apply properties of operations and the order of operations to solve equations in the remaining lessons in this topic. 5 aa Topic G: Solving Equations 243

4 Lesson 23 - Lesson 23: Student Outcomes Students explain what the equality and inequality symbols including =, <, >,, and represent. They determine if a number sentence is true or false based on the given symbol. Lesson Notes For students to be prepared to solve equations later in this module, it is important that they understand truth values in number sentences and in equations. In the next three lessons, students will learn to differentiate between number sentences and generic equations. Later, in Lesson 26, students will learn why number sentences play a fundamental role in understanding both equations with unknown numbers and solution sets of equations that contain variables. Number sentences are special among types of equations because they have truth values. A number sentence is the most concrete version of an equation. It has the very important property that it is always true or always false, and it is this property that distinguishes it from a generic equation. Examples include = 5 (true) and = 5 (false). The property guarantees the ability to check whether or not a number is a solution to an equation with a variable. Just substitute the number into the variable; then, check to see if the resulting number sentence is either true or false. If the number sentence is true, the number is a solution. For that reason, number sentences are the first and most important type of equation that students need to understand. We begin Lesson 23 by first determining what is true and false and then moving to true and false number sentences using equality and inequality symbols. Classwork Opening (4 minutes) Discuss the meaning of true and false by calling on students to tell if the following statements are true or false. Conclude with a discussion of what makes a number sentence true or false. Earth orbits the Sun. True. George Washington was the first President of the United States. True. There are 25 hours in a day. False = 6. True = 5. False. Why is = 5 a false number sentence? Answers will vary but should include the idea that the expressions on both sides of the equal sign should evaluate to the same number; so, for this number sentence to be true, either the first or second addend should be three, resulting in the sum of five. Lesson 23: 244

5 Lesson 23 Opening Exercise/Discussion (8 minutes) Discuss what each symbol below stands for, and provide students with an example. Students can complete the table in their student materials. Have one student come up to the front of the room and stand against the wall or board. Mark the student s height with a piece of masking tape. (It is important to pick a student who is about average height.) Measure the height of the tape mark using a tape measure, and record it as a mixed number in feet, along with the student s name, on the piece of masking tape. Next, start the following table on the board/screen: Opening Exercise Determine what each symbol stands for and provide an example. Symbol What the Symbol Stands For Example = is equal to = What is another example of a number sentence that includes an equal symbol? Answers will vary. You may ask more than one student. The student s height is the height marked by the tape on the wall. Have students stand next to the marked height. Discuss how their heights compare to the height of the tape. Are there other students in the room who have the same height? > is greater than > Use the student s height measurement in the example (our example uses a student 4 7 ft. in height). 8 What is another example of a number sentence that includes a greater than symbol? Answers will vary. You may ask more than one student. Have students taller than the tape on the wall stand near the tape. Discuss how more than one student has a height that is greater than the tape so there could be more than one number we could insert into the inequality: > < is less than < What is another example of a number sentence that includes a less than symbol? Answers will vary. You may ask more than one student. Have students shorter than the tape on the wall stand near the tape. Discuss how more than one student has a height that is less than the tape so there could be more than one number we could insert into the inequality: < Lesson 23: 245

6 Lesson 23 is less than or equal to What is another example of a number sentence that includes a less than or equal to symbol? Answers will vary. You may ask more than one student. Ask students who are the exact height as the tape and students who are shorter than the tape to stand near the tape. Discuss how this symbol is different than the previous symbol. is greater than or equal to What is another example of a number sentence that includes a greater than or equal to symbol? Answers will vary. You may ask more than one student. Which students would stand near the tape to demonstrate this symbol? Students who are the same height as or taller than the tape. Example 1 (5 minutes) Display each of the equations and inequalities one by one for the students to review and determine whether they result in a true or a false number sentence. Example 1 For each equation or inequality your teacher displays, write the equation or inequality, and then substitute 33 for every xx. Determine if the equation or inequality results in a true number sentence or a false number sentence. Display 5 + xx = 8. Substitute 3 for xx and evaluate. Does this result in a true number sentence or a false number sentence? True. Why is the number sentence a true number sentence? Each expression on either side of the equal sign evaluates to 8. 8 = 8. Display 5xx = 8. Substitute 3 for xx and evaluate. Does this result in a true number sentence or a false number sentence? False. Why is the number sentence a false number sentence? Five times three equals fifteen. Fifteen does not equal eight, so the number sentence 5(3) = 8 is false. Display 5 + xx > 8. Substitute 3 for xx and evaluate. Does this result in a true number sentence or a false number sentence? False. Lesson 23: 246

7 Lesson 23 Why is the number sentence a false number sentence? Each expression on either side of the inequality sign evaluates to 8. However, the inequality sign states that eight is greater than eight, which is not true. We have already shown that 8 = 8. Display 5xx > 8. Substitute 3 for xx and evaluate. Does this result in a true number sentence or a false number sentence? True. Why is the number sentence a true number sentence? When three is substituted, the left side of the inequality evaluates to fifteen. Fifteen is greater than eight, so the number sentence is true. Display 5 + xx 8. Substitute 3 for xx and evaluate. Does this result in a true number sentence or a false number sentence? True. Why is the number sentence a true number sentence? Each expression on either side of the inequality sign evaluates to 8. Because the inequality sign states that the expression on the left side can be greater than or equal to the expression on the right side, the number sentence is true because we have already shown that 8 = 8. Can you find a number other than three that we can substitute for xx that will result in a false number sentence? Answers will vary, but any number less than three will result in a false number sentence. Exercises (13 minutes) Students work on the following exercises independently. Note that students are writing complete sentences to describe what happens when a variable is substituted with a number and whether it turns the equation into a true number sentence or a false number sentence. Exercises Substitute the indicated value into the variable, and state (in a complete sentence) whether the resulting number sentence is true or false. If true, find a value that would result in a false number sentence. If false, find a value that would result in a true number sentence xx = Substitute 88 for xx. MP.6 When 88 is substituted for xx, the number sentence is true. Answers will vary on values to make the sentence false; any number other than 88 will make the sentence false > Substitute for gg. 22 When is substituted for gg, the number sentence is false. 22 Answers will vary on values that make the sentence true; any number greater than 55 will make the sentence true. Lesson 23: 247

8 Lesson ff < 22. Substitute 88 for ff. 44 When 88 is substituted for ff, the number sentence is false. Answers will vary on values to make the sentence true; any number less than 88 will make the sentence true hh Substitute for hh. When is substituted for hh, the number sentence is true. Answers will vary on values to make the sentence false; any number less than will make the sentence false = 88. Substitute 66 for hh. hh When 66 is substituted for hh, the number sentence is false. 22 is the only value that will make the sentence true > kk Substitute for kk. 22 When is substituted for kk, the number sentence is true. 22 Answers will vary on values to make the sentence false; the number or any number greater than will make 44 the sentence false. MP dd > Substitute for dd. When is substituted for dd, the number sentence is false. Answers will vary on values to make the sentence true; any number less than 22 will make the number sentence true Substitute 11 for pp. 22 When 11 is substituted for pp, the number sentence is false. 22 Answers will vary on values to make the sentence true; the number or any number less than 11 will make the 44 sentence true. 9. ww < Substitute 1111 for ww. 22 When 1111 is substituted for pp, the number sentence is true. Answers will vary on values to make the sentence false; the number 6666 or any other number greater than 6666 will make the sentence false bb. Substitute 1111 for bb. When 1111 is substituted for bb, the number sentence is true. Answers will vary on values to make the sentence false; any number greater than 1111 will make the sentence false. Lesson 23: 248

10 Lesson 23 Lesson Summary NUMBER SENTENCE: A number sentence is a statement of equality (or inequality) between two numerical expressions. TRUTH VALUES OF A NUMBER SENTENCE: A number sentence that is an equation is said to be true if both numerical expressions evaluate to the same number; it is said to be false otherwise. True and false are called truth values. Number sentences that are inequalities also have truth values. For example, 33 < 44, > , and ( ) 22 < are all true number sentences, while the sentence 99 > 33(44) is false. Exit Ticket (5 minutes) Lesson 23: 250

11 Lesson 23 Name Date Lesson 23: Exit Ticket Substitute the value for the variable and state in a complete sentence whether the resulting number sentence is true or false. If true, find a value that would result in a false number sentence. If false, find a value that would result in a true number sentence aa 75. Substitute 5 for aa bb = 30. Substitute 10 for bb > 86 h. Substitute 46 for h mm. Substitute 5 for mm. Lesson 23: 251

12 Lesson 23 Exit Ticket Sample Solutions Substitute the value for the variable and state in a complete sentence whether the resulting number sentence is true or false. If true, find a value that would result in a false number sentence. If false, find a value that would result in a true number sentence Substitute 55 for aa. When 55 is substituted in for aa, the number sentence is true. Answers will vary, but any value for aa less than 55 will result in a false number sentence bb = Substitute 1111 for bb. When 1111 is substituted in for bb, the number sentence is false. The only value for bb that will result in a true number sentence is > 8888 hh. Substitute 4444 for hh. When 4444 is substituted in for hh, the number sentence will be false. Answers will vary, but any value for hh greater than 6666 will result in a true number sentence Substitute 55 for mm. When 55 is substituted in for mm, the number sentence is false. Answers will vary, but the value of 44 and any value less than 44 for mm will result in a true number sentence. Problem Set Sample Solutions Substitute the value for the variable, and state (in a complete sentence) whether the resulting number sentence is true or false. If true, find a value that would result in a false number sentence. If false, find a value that would result in a true number sentence = hh. Substitute for hh. 66 When is substituted in for hh, the number sentence is true. Answers will vary, but any value for hh other than will result in a false number sentence > Substitute 11 for gg. 44 When is substituted in for gg, the number sentence is false. Answers will vary, but any value for gg less than will result in a true number sentence. 3. ff 33. Substitute 1111 for ff. 44 When 1111 is substituted in for ff, the number sentence is true. Answers will vary, but any value for ff greater than 1111 will result in a false number sentence. Lesson 23: 252

13 Lesson rr. Substitute 2222 for rr. When 2222 is substituted in for rr, the number sentence is true. Answers will vary, but any value for rr greater than 2222 will result in a false number sentence = 66. Substitute 1111 for qq. qq When 1111 is substituted in for qq, the number sentence is false. The number 99 is the only value for qq that will result in a true number sentence. Create a number sentence using the given variable and symbol. The number sentence you write must be true for the given value of the variable. 6. Variable: dd Symbol: The sentence is true when 55 is substituted for dd. 7. Variable: yy Symbol: The sentence is true when 1111 is substituted for yy. 8. Variable: kk Symbol: < The sentence is true when 88 is substituted for kk. 9. Variable: aa Symbol: The sentence is true when 99 is substituted for aa. Answers will vary for Problems 6 9. Lesson 23: 253

14 Lesson 23 Lesson 23: Classwork Opening Exercise Determine what each symbol stands for and provide an example. Symbol What the Symbol Stands For Example = > < Example 1 For each equation or inequality your teacher displays, write the equation or inequality, and then substitute 3 for every xx. Determine if the equation or inequality results in a true number sentence or a false number sentence. Lesson 23: S.107

15 Lesson 23 Exercises Substitute the indicated value into the variable, and state (in a complete sentence) whether the resulting number sentence is true or false. If true, find a value that would result in a false number sentence. If false, find a value that would result in a true number sentence xx = 12. Substitute 8 for xx. 2. 3gg > 15. Substitute 4 1 for gg ff < 2. Substitute 8 for ff h Substitute 25.8 for h = 8. Substitute 6 for h. h 6. 3 > kk Substitute 1 1 for kk dd > 2.5. Substitute 2.5 for dd pp. Substitute 1 for pp ww < 32. Substitute 16 for ww bb. Substitute 14 for bb. Lesson 23: S.108

16 Lesson 23 Lesson Summary NUMBER SENTENCE: A number sentence is a statement of equality (or inequality) between two numerical expressions. TRUTH VALUES OF A NUMBER SENTENCE: A number sentence that is an equation is said to be true if both numerical expressions evaluate to the same number; it is said to be false otherwise. True and false are called truth values. Number sentences that are inequalities also have truth values. For example, 3 < 4, > 15 12, and (15 + 3) 2 < are all true number sentences, while the sentence 9 > 3(4) is false. Problem Set Substitute the value into the variable, and state (in a complete sentence) whether the resulting number sentence is true or false. If true, find a value that would result in a false number sentence. If false, find a value that would result in a true number sentence = h. Substitute 2 1 for h > 156gg. Substitute 1 for gg ff 3. Substitute 12 for ff rr. Substitute 23 for rr = 6. Substitute 10 for qq. qq Create a number sentence using the given variable and symbol. The number sentence you write must be true for the given value of the variable. 6. Variable: dd Symbol: The sentence is true when 5 is substituted for dd. 7. Variable: yy Symbol: The sentence is true when 10 is substituted for yy. 8. Variable: kk Symbol: < The sentence is true when 8 is substituted for kk. 9. Variable: aa Symbol: The sentence is true when 9 is substituted for aa. Lesson 23: S.109

17 : Student Outcomes Students identify values for the variables in equations and inequalities that result in true number sentences. Students identify values for the variables in equations and inequalities that result in false number sentences. Lesson Notes Beginning in the previous lesson and continuing here, the language used in answering questions has been carefully chosen. We have purposefully elicited responses from students in the form of numbers, quantities, or sentences. Soon, students will see that another way to report an answer to an equation or inequality is another equation or inequality. For example, the solution to 3xx 15 can be reported as xx 5. During this lesson, students will discover that solutions and solution sets can be represented by a sentence description, leading to (or followed by) the use of equations or inequalities. This discussion will provide students with knowledge to systemically solve and check one-step equations later in the module. For example, in this lesson, students transition from The inequality is true for any value of xx that is greater than or equal to five, to The inequality is true when xx 5. This transition is preparing students to understand why they rewrite complicated-looking equations and inequalities as simpler ones (such as xx = 5 or xx 5) to describe solutions. This is an important goal in the solution process. The symbol has purposefully been omitted in these lessons because it does not satisfy all of the properties listed in Tables 4 and 5 of the Common Core State Standards. However, it is a symbol that is useful and easy to understand. Its absence from the lessons does not mean that you cannot use it in your class, nor should it be forgotten. Classwork Opening Exercise (3 minutes) Opening Exercise State whether each number sentence is true or false. If the number sentence is false, explain why. a > 99 False is not greater than 99. b = 1111 True. c > True. : 254

18 d < 6666 True. e False is not greater than or equal to Students share their answers and defend their decisions for each problem. Example 1 (10 minutes) The teacher leads the following discussion after students complete the table below. Have students work on the first two columns alone or in groups of two, writing true or false if the number substituted for gg results in a true or false number sentence. Example 1 Write true or false if the number substituted for gg results in a true or false number sentence. Substitute gg 44gg = 3333 gg = 88 33gg 3333 gg 1111 > 22 gg with 22 gg > gg gg True True False False True True True True 44 False False False False False False False False 22 False False False False False False False False 00 False False False False False False False False 1111 False False True True True True True True Let s look at 4gg = 32 and gg = 8. What do you notice happens when 8 is substituted for gg in both of the equations? 8 makes both of the equations result in true number sentences. What do you notice about the substitutions with 4, 2, 0, and 10? Each of those substituted values makes the equations result in false number sentences. Why do you think that happened? Because they are both equations, we expect that only one number can be substituted for gg to result in a true number sentence. In this case, 8 is the only number that can be substituted to make both equations true. How are 4gg = 32 and gg = 8 related? You can get from 4gg = 32 to gg = 8 by dividing both sides of 4gg = 32 by 4. You can get from gg = 8 to 4gg = 32 by multiplying both sides of gg = 8 by 4. In which equation is it easier to observe the value of gg that makes the number sentence true? The second. It is certainly easier to recognize the value in the second equation. Let s look at the next set of inequalities: 3gg 30 and gg 10. (Let students fill out the table for these two columns.) What do you notice happens when 10 is substituted for gg in both of the inequalities? 10 makes both of the inequalities result in true number sentences. : 255

19 Let s substitute some numbers into each inequality to test. For the second inequality, as long as the number is greater than or equal to 10, the inequality will result in a true number sentence. Let s read the inequality aloud together. Chorally: gg is greater than or equal to 10. Let s try is greater than or equal to 10. Substitute 11 for gg in 3gg 30. Does this result in a true number sentence? Yes. How are 3gg 30 and gg 10 related? You can get from 3gg 30 to gg 10 by dividing both sides of 3gg 30 by 3. You can get from gg 10 to 3gg 30 by multiplying both sides of gg 10 by 3. In which inequality is it easier to observe the value of gg that makes the number sentence true? The second, which is similar to the first example. Continue testing the substitutions, and continue the discussion for the remaining sets of inequalities (but do not ask how the last two inequalities are related). The goal is to have students discover that for each set of equations and inequalities, the second in the set represents a much clearer way to represent the solutions. Point out to students that the second equation or inequality will play an important role in the next few lessons. Please note that it is not necessary that students fully understand a process for solving equations and inequalities from these examples. Example 2 (10 minutes) Guide students in how to use mental math to answer the questions. Students do not know how to solve one-step equations using a formal method; therefore, they will need guidance in solving these problems. Please note that the second problem includes the use of subtraction to get a negative value. While operations with integers is a Grade 7 topic, this example should be accessible using a visual model. Example 2 State when the following equations/inequalities will be true and when they will be false. a. rr = 2222 MP.6 Can you think of a number that will make this equation true? Yes, substituting 10 for rr will make a true number sentence. Is 10 the only number that results in a true number sentence? Why or why not? Yes, there is only one value that, if substituted, will result in a true number sentence. There is only one number that can be added to 15 to get exactly 25. What will make the number sentence false? Any number that is not 10 will result in a false number sentence. If we look back to the original questions, how can we state when the equation will be true? False? The equation is true when the value substituted for rr is 10 and false when the value of rr is any other number. b. 66 dd > 00 : 256

20 If we wanted 6 dd to equaaaa 0, what would the value of dd have to be? Why? The value of dd would have to be 6 because 6 6 = 0. Will substituting 6 for dd result in a true number sentence? Why or why not? If dd has a value of 6, then the resulting number sentence would not be true because the left side has to be greater than 0, not equal to 0. How about substituting 5 for dd? 4? 3? 2? Yes, substituting any of these numbers for dd into the inequality results in true number sentences. What values can substitute for dd in order for the resulting number sentence to be true? The inequality is true for any value of dd that is less than 6. What values for dd would make the resulting number sentence false? The inequality is false for any value of dd that is greater than or equal to 6. Let s take a look at a number line and see why these statements make sense. Display a number line on the board. Label the number line as shown below MP.6 Let s begin at 6. If I were to subtract 1 from 6, where would that place be on the number line? 5. So, if we substitute 1 for dd, then 6 1 = 5, and the resulting number sentence is true. How about if I subtracted 2 from 6? Would our number sentence be true for the value 2? Yes. What if I subtracted 6 from the 6 on the number line? Where would that be on the number line? 0. So, if we substitute 6 for dd, will the resulting number sentence be true or false? False. Let s try one more. We have already determined that any number greater than or equal to 6 will result in a false number sentence. Let s try a number greater than 6. Let s try the number 7. Start with the 6 on the number line. If we were to subtract 7, in which direction on the number line would we move? To the left And how many times will we move to the left? 7 Model beginning at 6 on the number line and move your finger, or draw the unit skips, as you continually move to the left on the number line 7 times So, it seems we have ended up at a place to the left of 0. What number is represented by this position? 1 : 257

21 Label the number line with 1. Using our knowledge of ordering rational numbers, is 1 greater than or less than 0? Less than. So, we have shown that the inequality is true for any value of dd that is less than 6 (dd < 6) and is false when the value of dd is greater than or equal to 6 (dd 6). Continue to discuss how to answer each question below with students. As students gain more confidence, have them try to solve the problems individually; discuss the answers when students are finished. c. 11 ff = The equation is true when the value substituted for ff is 3333 (ff = 3333) and false when the value of ff is any other number (ff 3333). d. yy 33 < 1111 The inequality is true for any value of yy that is less than 3333 (yy < 3333) and false when the value of yy is greater than or equal to 3333 (yy 3333). e. 77gg 4444 MP.6 The inequality is true for any value of gg that is greater than or equal to 66 (gg 66) and false when the value of gg is less than (gg < 66). f. aa The inequality is true for any value of aa that is less than or equal to 2222 (aa 2222) and false when the value of aa is greater than 2222 (aa > 2222). Exercises (10 minutes) Students complete the following problems in pairs. Exercises Complete the following problems in pairs. State when the following equations and inequalities will be true and when they will be false cc > 4444 The inequality is true for any value of cc that is greater than 33 (cc > 33) and false when the value of cc is less than or equal to 33 (cc 33) = dd 1111 The equation is true when the value of dd is 3333 (dd = 3333) and false when the value of dd is any other number (dd 3333) ee The inequality is true for any value of ee that is less than or equal to 2222 (ee 2222) and false when the value of ee is greater than 2222 (ee > 2222). : 258

22 4. hh The inequality is true for any value of hh that is greater than or equal to 6666 (hh 6666) and false when the value of hh is less than 00 (hh < 6666) > hh The inequality is true for any value of hh that is less than 1111 (hh < 1111) and false when the value of hh is greater than or equal to 1111 (hh 1111) aa 1111 The inequality is true for any value of aa that is less than or equal to 44 (aa 44) and false when the value of aa is greater than (aa > 44) xx = 2222 The equation is true when the value of xx is 88 (xx = 88) and false when the value of xx is any other number (xx 88). MP.6 Identify all equality and inequality signs that can be placed into the blank to make a true number sentence = or or > or < or = or or < or Closing (7 minutes) For the past two lessons, we have been using sentences to describe when values substituted for variables in equations and inequalities result in true number sentences or false number sentences. Let s take a look at an example from each of the past two lessons. Display the following equation on the board: 5 + xx = 8. Substituting 3 for xx in the equation results in a true number sentence: = 8. Let s evaluate to be sure. What is the sum of 5 + 3? 8 : 259

23 Does 8 = 8? Yes. So, when we substitute 3 for xx, the equation results in a true number sentence. Let s try to substitute 3 for xx in xx = 3. Display xx = 3 on the board. If we substituted 3 for xx, what would our number sentence look like? 3 = 3 Is this a true number sentence? Yes. Previously, we described the values of xx that would make the equation 5 + xx = 8 true in a sentence. Display on the board: The equation is true when the value of xx is 3. This is the same sentence we would write for the equation xx = 3. Therefore, we can shorten this sentence and, instead, say: The equation is true when xx = 3. Display on the board: The equation is true when xx = 3. Let s look at an inequality from today: Display 4aa 16 on the board. What numbers did we determine would make this inequality result in a true number sentence? We determined that any number less than or equal to 4 would result in a true number sentence. Write this statement on the board: The inequality is true for any value of aa that is less than or equal to 4. Is there any way we can abbreviate or shorten this statement using symbols instead of words? Display aa 4 on the board. Let s read this aloud. aa is less than or equal to four. We can use this inequality to rewrite the sentence. Display on the board: The inequality is true when aa 4. Either sentence is a correct way to state the values that make 4aa 16 true. Exit Ticket (5 minutes) : 260

24 Name Date : Exit Ticket State when the following equations and inequalities will be true and when they will be false. 1. 5gg > = 5 + kk ww < aa h 16 : 261

25 Exit Ticket Sample Solutions State when the following equations and inequalities will be true and when they will be false gg > 4444 The inequality is true for any value of gg that is greater than 99 and false when the value of gg is less than or equal to 99. OR The inequality is true when gg > 99 and false when gg = 55 + kk The equation is true when the value of kk is 99 and false when the value of kk is any other number. OR The equation is true when kk = 99 and false when kk ww < 1111 The inequality is true for any value of ww that is greater than 1111 and false when the value of ww is less than or equal to OR The inequality is true when ww > 1111 and false when ww aa + 88 The inequality is true for any value of aa that is greater than or equal to 2222 and false when the value of aa is less than OR The inequality is true when aa 2222 and false when aa < hh 1111 The inequality is true for any value of hh that is less than or equal to 88 and false when the value of hh is greater than 88. OR The inequality is true when hh 88 and false when hh > 88. Problem Set Sample Solutions State when the following equations and inequalities will be true and when they will be false = 99kk The equation is true when the value of kk is 44 and false when the value of kk is any number other than 44. OR The equation is true when kk = 44 and false when kk > ff 1111 The inequality is true for any value of ff that is less than 8888 and false when the value of ff is greater than or equal to OR The inequality is true when ff < 8888 and false when ff : 262

26 3. vv 99 = 33 The equation is true when the value of vv is 2222 and false when the value of vv is any number other than OR The equation is true when vv = 2222 and false when vv bb > 4444 The inequality is true for any value of bb that is greater than 3333 and false when the value of bb is less than or equal to OR The inequality is true when bb > 3333 and false when bb dd The inequality is true for any value of dd that is greater than or equal to 4444 and false when the value of dd is less than OR The inequality is true when dd 4444 and false when dd < ff < 6666 The inequality is true for any value of ff that is less than 22 and false when the value of ff is greater than or equal to 22. OR The inequality is true when ff < 22 and false when ff hh 77 The inequality is true for any value of hh that is greater than or equal to 33 and false when the value of hh is less than 33. OR The inequality is true when hh 33 and false when hh < gg The inequality is true for any value of gg that is less than or equal to 5555 and false when the value of gg is greater than OR The inequality is true when gg 5555 and false when gg > mm 33 = 1111 The equation is true when the value of mm is 4444 and false when the value of mm is any number other than OR The equation is true when mm = 4444 and false when mm : 263

27 : Classwork Opening Exercise State whether each number sentence is true or false. If the number sentence is false, explain why. a > 9 b. 3 6 = 18 c. 32 > 64 4 d < 68 e Example 1 Write true or false if the number substituted for gg results in a true or false number sentence. Substitute gg with gg = 32 gg = 8 3gg 30 gg 10 gg > 2 2 gg > gg gg 8 : S.110

28 Example 2 State when the following equations/inequalities will be true and when they will be false. a. rr + 15 = 25 b. 6 dd > 0 c. 1 ff = 15 2 d. yy 3 < 10 e. 7gg 42 f. aa 8 15 Exercises Complete the following problems in pairs. State when the following equations and inequalities will be true and when they will be false cc > 45 : S.111

29 2. 25 = dd ee 4. h > h aa xx = 24 Identify all equality and inequality signs that can be placed into the blank to make a true number sentence : S.112

30 : S.113

31 Problem Set State when the following equations and inequalities will be true and when they will be false = 9kk > ff vv 9 = bb > dd ff < h gg 9. mm 3 = 14 : S.114

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