Time to the Minute R78. Tommy wants to know what time the clock shows. He also wants to know one way to write the time.

Transcription

1 Lesson. Time to the Minute Tommy wants to know what time the clock shows. He also wants to know one way to write the time. Step Where is the hour hand pointing? What is the hour? It points just after the 6, so the hour is 6. Step Where is the ute hand pointing? It points just after the. Count the utes. Count zero at the. Count on by fi ves:,,. Then count on by ones: 6, 7. So, the time is 6:7, or seventeen utes after six Write the time. Write one way you can read the time..... Grade R7

2 Lesson. a.m. and p.m. Lori and her father went shopping at the time shown on the clock at the right. How should Lori write the time? Use a.m. or p.m. Step Read the time on the clock. :0 Step Decide if the time is A.m. or p.m. Write p.m. for times after noon and before midnight. Write a.m. for times after midnight and before noon. REMEMBER Noon is :00 in the daytime. Midnight is :00 at night. Think: Most people go shopping during the day. So, Lori should write the time as :0 a.m. Write the time for the activity. Use a.m. or p.m.. leave school. eat dinner. arrive at school :0. Mackenzie s violin lesson starts at the time shown on the clock. Write the time using a.m. or p.m.. The diner opens for breakfast at the time shown on the clock. Write the time using a.m. or p.m. Grade R7

3 Lesson. Measure Time Intervals Julia starts her homework at :0 p.m. She fi nishes at :00 p.m. How much time does Julia spend doing homework? Elapsed time is the amount of time that passes from the start of an activity to the end of the activity. Use a number line to find elapsed time. Step Begin with the start time, :0. Step Skip count by tens to count the utes from :0 to :00. Step Label the number line. Draw jumps for every utes until you get to :00. 0 utes :0 :0 :0 :0 :00 Step Add the utes that have elapsed. 0 utes So, Julia spends 0 utes doing homework. Use the number line to find the elapsed time.. Start: : p.m. End: : p.m.. Start: :0 a.m. End: :6 a.m. : Find the elapsed time.. Start: : p.m. End: :6 p.m.. Start: :0 a.m. End: : a.m. Grade R0

4 Lesson. Use Time Intervals You can use a number line to find the starting time when you know the ending time and the elapsed time. The ending time is :0 p.m. Use the number line to find the starting time if the elapsed time is utes. Step Find the ending time on the number line. Think: The ending time is :0 p.m. Step Jump back utes. Think: Jump back utes to get to the hour. You jump back to :00 p.m. 0 Step Jump back 0 utes. Think: Jump back 0 utes to get to a total of utes. You jump back to :0 p.m. :0 P.M. :00 P.M. :0 P.M. So, the starting time is :0 p.m.. Use the number line to find the starting time if the elapsed time is utes.. Use the number line to find the starting time if the elapsed time is utes. : A.M. R 6:00 P.M. Grade

5 Lesson. Problem Solving Time Intervals As soon as Carter got home, he worked on his book report for utes. Then he did chores for 0 utes. He finished at : p.m. At what time did Carter get home? Read the Problem What do I need to find? I need to find what time got home. What information do I need to use? Carter worked for Carter utes on Solve the Problem Find Carter s : p.m. finishing time on the number line. Count back 0 utes using two -ute jumps to find the time Carter started his chores. : p.m. his report. He did chores for 0 utes. He finished : :00 : P.M. at : p.m.. How will I use the information? I will use a number line and count back to find the time Carter got home. Count back utes for the time Carter worked on his report. The jumps end at :00 p.m. :00 So, Carter got home at : :00 : P.M. :00 p.m.. Kiera must be at school at 7: a.m. The ride to school takes utes. She needs utes to eat breakfast and get ready. At what time should Kiera get up?. Jack and his family go to the movies. First, they eat lunch at :0 p.m. It takes them 0 utes to eat. Then they drive utes to get to the movie theater. At what time do Jack and his family get to the theater? Grade R

6 Lesson.6 Measure Length You can measure length to the nearest half or fourth inch. Use a ruler to measure lines A C to the nearest half inch. A B C Step Line up the left end of Line A with the zero mark on the ruler. Step The right end of Line A is between the half-inch marks _ for and. _ The mark that is closest to the right end is for inches. _ So, the length of Line A to the nearest half inch is inches. Repeat Steps and for lines B and C. The length of Line B to the nearest half inch is The length of Line C to the nearest half inch is _ inches. inches. Measure the length to the nearest half inch. Is the crayon closest to _ inches, inches, or _ inches?. inches. inches Grade R

7 Lesson.7 Estimate and Measure Liquid Volume Liquid volume is the amount of liquid in a container. You can measure liquid volume using the metric unit liter (L). A water bottle holds about liter. Estimate how much liquid a plastic cup and a fish bowl will hold. Then write the containers in order from the greatest to least liquid volume. A plastic cup holds less than liter. Think: A plastic cup is smaller than a water bottle. A water bottle holds about liter. A fish bowl holds more than liter. Think: A fish bowl is larger than a water bottle. So, the order of the containers from greatest to least liquid volume is fish bowl, water bottle, plastic cup.. A wading pool is filled with water. Is the amount more than liter, about liter, or less than liter? Estimate how much liquid volume there will be when the container is filled. Write more than liter, about liter, or less than liter.. vase. mug. bathtub Grade R

8 Lesson. Estimate and Measure Mass Mass is the amount of matter in an object. You can measure mass using the metric units gram (g) and kilogram (kg). Should you use gram or kilogram to measure the mass of a penny? The mass of one grape is about gram. The mass of a book is about kilogram. Think: The mass of a penny is closer to the mass of a grape than to the mass of a book. So, use grams to measure the mass of a penny. You can use a pan balance to compare the masses of an eraser and a stapler. Think: The pan with the stapler is lower. So, the mass of a stapler is more than the mass of an eraser. Choose the unit you would use to measure the mass. Write gram or kilogram.. cherry. cat. pencil. Compare the masses of the objects. Write is less than, is the same as, or is more than. The mass of the pencil the mass of the apple. Grade R

9 Lesson. Solve Problems About Liquid Volume and Mass You can use a model or write an equation to solve problems about liquid volume and mass. Tina s watering can holds liters of water. Todd s watering can holds 6 liters of water. What is the total liquid volume of both watering cans? Tina s Watering Can Todd s Watering Can L 6 L Use a bar model. L 6 L L Think: Add to find the total. Write an equation. Think: I can write an addition equation to find the sum of the liquid volumes. 6 So, the total liquid volume is L. L 6 L L So, the total liquid volume is L. Write an equation and solve the problem.. Kyra has a small bucket that holds liters of water and a large bucket that holds liters of water. Altogether, how many liters of water do the two buckets hold?. Rick s recipe calls for grams of raisins and 0 grams of nuts. How many more grams of nuts than raisins does the recipe call for? Grade R6