# REVIEW Chapter 1 The Real Number System

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1 REVIEW Chapter The Real Number System In class work: Complete all statements. Solve all exercises. (Section.4) A set is a collection of objects (elements). The Set of Natural Numbers N N = {,,, 4, 5, } The Set of Whole Numbers W N W W = { 0,,,, 4, 5, } The Set of Integers Z N W Z Z = {, -4, -, -, -,0,,,, 4, 5, } The Set of Rational Numbers Q N W Z Q a Q = ab, Z, b 0 b The Set of Irrational Numbers Examples:, 5,π The Set of Real Numbers R N W Z Q R R = { x xisrational or xis irrational } Exercise # Decide whether each statement is true or false: a) Every natural number is positive. true b) Every whole number is positive. false (0 is neither + nor -) c) Every integer is a rational number. true Exercise # List all numbers from the set 9, 7,,, 0, 5,, 5.9, 7 that are 4 5 a) natural numbers, 7 b) whole numbers but not natural numbers 0 c) odd integers -9,, 7 d) rational numbers -9, - ¼, -/5, 0,, 5.9, 7 e) irrational numbers 7, 5

2 (Section.) Mathematical Symbols SYMBOL MEANING EXAMPLES = is equal to is not equal to belongs to ( about an element) it doesn t belong to < is less than is less than or equal to > is greater than is greater than or equal to A number a is less than a number b ( a< b) if a is to the left of b on the number line. Exercise # Write equivalent statements: a) b) 0> 5 5< 0 c) 5> 6 6 < 5 d) 4 < > 4 Exercise #4 Fill in the appropriate ordering symbol: either <, >, or =. a) > -5 b) 9 > 4 0 c) 4 4 = 4 0 Exercise #5 Write each word statement in symbols: a) Fifteen is equal to five plus ten. 5 = b) Nine is greater than five minus four. 9 > 5 4 c) Sixteen is not equal to nineteen. 6 9 d) Two is less than or equal to three.

3 (Section.7) Properties of Real Numbers PROPERTIES ADDITION + MULTIPLICATION COMMUTATIVITY a+ b= b+ a, ab, R ab = ba ab, R ASSOCIATIVITY ( a+ b) + c = a + ( b + c), abc,, R ( ab) c = abc ( ), abc,, R IDENTITY ELEMENT Zero 0 a+ 0 = 0 + a, a R One a = a, a R INVERSE ELEMENT a R, there is a R such that a+ ( a) = ( a) + a= 0 a R, a 0, there is a R such that a = a= a a Exercise #6 Find the opposite and the reciprocal (if any) of each number: The Number Its Opposite Its Reciprocal none The Double Negative Rule ( a) = a Exercise #7 Identify the property used in each example: a.( ) + ( ) = ( ) + ( ) commutative property for addition b.[( )]( ) = [( )( )] associative property for multiplication c. = identity element for multiplication d.[( 9) + 7] + 54 = ( 9) + [(7+ 54)] associative property for addition e.( 0)(9) = 9( 0) commutative property for multiplication f = = 00 identity element for addition

4 (Section.4) 4 The Absolute Value of a Number () The absolute value of a number is the distance between the number and 0 (the origin) on the number line. a = dist( a,0) Property a 0, a R () a a, if a 0 = a, if a < 0 Exercise #8 Simplify the following: a) 7 = 7 b) ( 7) = 7 c) 7 = -7 d) ( 7) = -7 Exercise #9 Fill in the appropriate ordering symbol: either <, >, or =. a) < 4 b) < 4 c) 6 < 4 d) 6< ( ) e) 8 < 9 f) 6 5 < 6

5 5 (Sections.,.5,.6) Operations with Real Numbers Adding Real Numbers Same sign - Add the absolute values of the numbers. - The sum has the same sign as the given numbers. Different signs - Find the difference between the larger absolute value and the smaller. - The sum has the sign of the number with the larger value. Subtracting Real Numbers a b= a+ ( b) Multiplying Real Numbers Dividing Real Numbers a = a b b n Exponent a = aa... a, n N n times a is called base n is called power (exponent) Exercise #0 Simplify the following: a) 5 = 5 e) b) ( 5) = 5 f) ( ) c) 5 = - 5 g) d) ( 5) = - 5 h) ( ) = 8 i) = - 8 j) = - 8 k) = 8 = 7 4 = = 6

6 6 Order of Operations If grouping symbols are present, simplify within them, innermost first, in the following order: Step Step Step powers multiplications and divisions in order from left to right additions and subtractions in order from left to right Exercise # Simplify the following: (See solutions at the end of the handout) a) 7 8 b) ( ) c) ( ) d) ( 4) ( ) + ( ) 5 e) ( ) ( ) 8 4 f) g) ( 5) + 0 () ( ) () + 4 ( ) h) (4 7)(0 ) [ 0( ) + ( )] i) ( )( 7)( 6) + ( )( 7) ( 5) j) Exercise # Translate each phrase into a mathematical statement: a) The sum of 5 and and 6 (-5) b) 4 added to the sum of 9 and 4. [(-9) + ( 4)] + 4 c) The difference between 4 and 8 4 ( 8) d) The sum of 9 and 4, decreased by 7. [9 + ( 4)] 7 e) less than the difference between 8 and 5. [8 ( 5)] f) The product of 9 and, added to [( 9)] g) Twice the product of and 6, subtracted from 4. ( 4) [( )6] h) The quotient of and the sum of 5 and. ( 5) + ( )

7 7 Sums, Terms, Products, and Factors Prime and Composite Numbers Sum is the word we use for addition. The numbers to be added in the sum are called terms. Product is the word we use for multiplication. The numbers being multiplied are called factors. a is divisible by b ( ab ) or b divides a ( b a) if, when dividing a by b, the remainder is 0. Equivalent statements a is divisible by b 6 is divisible by a is a multiple of b 6 is a multiple of b divides a divides 6 b is a factor of a is a factor of 6 b is a divisor of a is a divisor of 6 Exercise # List all the factors of: 0:,, 4, 5, 0, 0 5:, 5 :,,, 4, 6, 7:, 7 Property The number is a factor of any number. a, a R Any nonzero number is a factor of itself. a a, a 0 A prime number is a natural number (excluding) that is divisible only by and itself. A natural number greater than that is not prime is called composite. The Set of Prime Numbers: {,,5,7,,,7,9,,9,,... }

8 8 Tests for divisibility: A number is divisible by if its last digit is divisible by. if the sum of its digits is divisible by. 4 if the number formed by its last two digits is divisible by 4. 5 if the last digit is 0 or 5. 8 if the last three digits form a number divisible by 8. 9 if the sum of its digits is divisible by 9. 0 if its last digit is 0. Exercise #4 a) List all the factors of 4:,,, 4, 6, 8,, 4 b) List all the prime factors of 4:, c) List some multiples of :, 4, 6, 8, 0,, d) List all the factors of :, e) Find the prime factorization of each number: 5, 8, 08, * 5 00 * 5 0 * 6 5= 5 8= 7 08= 4 00= 5

9 (Section.) 9 Algebraic Expressions A variable is a symbol (usually a letter) that stands for a number (or numbers). Variables can be used: () in equations - variables represents unknown quantities - the variable is holding the place of a particular number (or numbers) that has not yet been identified but which needs to be found. x + = 5 () in general statements - the variable describes a general relationship between numbers and/or arithmetic operations. a+ b= b+ a A constant is a symbol whose value is fixed. An algebraic expression is a finite number of additions, subtractions, multiplications, and divisions of variables and constants. Note: An algebraic expression DOES NOT contain the = sign. An equation is a statement that two algebraic expressions are equal. The process of replacing the variable in an algebraic expression with specific values and evaluating the result is called algebraic substitution. Exercise #5 Evaluate the following expressions if x =, y =, z = : (See solutions at the end of the handout) xy a) z y x + b) yz c) yz ( xy)

10 0 Exercise #6 Translate each of the following algebraically: ) Eight more than three times a number. the unknown: let x be the number Translate: x + 8 Identify the statement: Algebraic Expression ) Three times the sum of eight and a number. the unknown let a be the number Translate: ( 8 + a ) Identify the statement: Algebraic Expression ) Two less than five times a number is 8. the unknown let n be the number Translate: 5n = 8 Identify the statement: Equation 7) Four less than a number is. the unknown: let t be the number Translate: t 4 = Identify the statement: Equation 8) The product of a number and seven more than the number. the unknown: let n be the number Translate: n (n + 7) Identify the statement: Algebraic Expression 9) The product of two more than a number and six less than the number. the unknown: let x be the number Translate: ( x + )( x 6 ) Identify the statement: Algebraic Expression 4) The sum of two numbers is four less than their product. the unknown(s): let x be one number, let y be the other number Translate: x + y = xy 4 Identify the statement: Equation 6) Four more than a number. the unknown: let x be the number Translate: x + 4 Identify the statement: Algebraic Expression

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