# 1-2 Properties of Real Numbers

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1 1-2 Properties of Real Numbers Warm Up Lesson Presentation Lesson Quiz 2

2 Warm Up Simplify Find 10% of \$ \$ Find the reciprocal of 4.

3 Objective Identify and use properties of real numbers.

4 The four basic math operations are addition, subtraction, multiplication, and division. Because subtraction is addition of the opposite and division is multiplication by the reciprocal, the properties of real numbers focus on addition and multiplication.

5 Properties Real Numbers Identities and Inverses For all real numbers n, WORDS Additive Identity Property The sum of a number and 0, the additive identity, is the original number. NUMBERS = 0 ALGEBRA n + 0 = 0 + n = n

6 Properties Real Numbers Identities and Inverses For all real numbers n, WORDS NUMBERS Multiplicative Identity Property The product of a number and 1, the multiplicative identity, is the original number. ALGEBRA n 1 = 1 n = n

7 Properties Real Numbers Identities and Inverses For all real numbers n, WORDS Additive Inverse Property The sum of a number and its opposite, or additive inverse, is 0. NUMBERS 5 + ( 5) = 0 ALGEBRA n + ( n) = 0

8 Properties Real Numbers Identities and Inverses For all real numbers n, WORDS NUMBERS Multiplicative Inverse Property The product of a nonzero number and its reciprocal, or multiplicative inverse, is 1. ALGEBRA

9 Recall from previous courses that the opposite of any number a is a and the reciprocal of any nonzero number a is.

10 Example 1A: Finding Inverses Find the additive and multiplicative inverse of each number. 12 additive inverse: 12 Check = 0 ü multiplicative inverse: The opposite of 12 is 12. The Additive Inverse Property holds. The reciprocal of 12 is. Check ü The Multiplicative Inverse Property holds.

11 Example 1B: Finding Inverses Find the additive and multiplicative inverse of each number. additive inverse: The opposite of is. multiplicative inverse: The reciprocal of is

12 Check It Out! Example 1A Find the additive and multiplicative inverse of each number. 500 additive inverse: 500 Check ( 500) = 0 ü The opposite of 500 is 500. The Additive Inverse Property holds. multiplicative inverse: The reciprocal of 500 is. Check ü The Multiplicative Inverse Property holds.

13 Check It Out! Example 1B Find the additive and multiplicative inverse of each number additive inverse: 0.01 multiplicative inverse: 100 The opposite of 0.01 is The reciprocal of 0.01 is 100.

14 Properties Real Numbers Addition and Multiplication For all real numbers a and b, WORDS NUMBERS ALGEBRA Closure Property The sum or product of any two real numbers is a real number = 5 2(3) = 6 a + b R ab R

15 Properties Real Numbers Addition and Multiplication For all real numbers a and b, WORDS NUMBERS ALGEBRA Commutative Property You can add or multiply real numbers in any order without changing the result = (11) = 11(7) a + b = b + a ab = ba

16 Properties Real Numbers Addition and Multiplication For all real numbers a and b, WORDS NUMBERS ALGEBRA Associative Property The sum or product of three or more real numbers is the same regardless of the way the numbers are grouped. (5 + 3) + 7 = 5 + (3 + 7) (5 3)7 = 5(3 7) a + (b + c) = a + (b + c) (ab)c = a(bc)

17 Properties Real Numbers Addition and Multiplication For all real numbers a and b, WORDS NUMBERS ALGEBRA Distributive Property When you multiply a sum by a number, the result is the same whether you add and then multiply or whether you multiply each term by the number and add the products. 5(2 + 8) = 5(2) + 5(8) (2 + 8)5 = (2)5 + (8)5 a(b + c) = ab + ac (b + c)a = ba + ca

18 Reading Math Based on the Closure Property, the real numbers are said to be closed under addition and closed under multiplication.

19 Example 2: Identifying Properties of Real Numbers Identify the property demonstrated by each question. A = Numbers are multiplied in any order without changing the results. Commutative Property of Multiplication B. The numbers have been regrouped. Associative Property of Addition

20 Check It Out! Example 2 Identify the property demonstrated by each equation. 2a. Numbers are multiplied in any order without changing the results. Commutative Property of Multiplication 2b. 9(12π) = (9 12)π The numbers have been regrouped. Associative Property of Multiplication

21 Example 3: Consumer Economics Application Use mental math to find a 5% tax on a \$42.40 purchase. Think: 10% of \$ %(42.40) = = 4.24 Move the decimal point left 1 place. Think: 5% = (10%) A 5% tax on a \$42.40 is \$ % is half of 10%, so find half of 4.24.

22 Check It Out! Example 3 Use mental math to find a 20% discount on a \$15.60 shirt. Think: 20% = 10% 2 10%(15.60) = = 1.56 Move the decimal point left 1 place = % is double 10%, so multiply 1.56 by 2. A 20% discount on a \$15.60 shirt is \$3.12.

23 Example 4A: Classifying Statements as Sometimes, Always, or Never True Classifying each statement as sometimes, always, or never true. Give examples or properties to support your answers. a b = a, where b = 3 sometimes true true example: 0 3 = 0 false example: True and false examples exist. The statement is true when a = 0 and false when a 0.

24 Example 4B: Classifying Statements as Sometimes, Always, or Never True Classifying each statement as sometimes, always, or never true. Give examples or properties to support your answers. 3(a + 1) = 3a + 3 always true Always true by the Distributive Property.

25 Check It Out! Example 4a Classify each statement as sometimes, always, or never true. Give examples or properties to support your answer. a + ( a) = b + ( b) Always true by the Additive Inverse Property.

26 Check It Out! Example 4b Classify each statement as sometimes, always, or never true. Give examples or properties to support your answer. a (b + c) = (a b) + (a c) sometimes true true example: 0 (1 + 2) = (0 1) + (0 2) 3 = 3 false example: 1 (2 + 3) = (1 2) + (1 3) 4 3 True and false examples exist. The statement is true when a = 0, b = 1, and c = 2. False when a = 1, b = 2, and c = 3.

27 Lesson Quiz Find the additive and multiplicative inverse of each number ; 2. ; Identify the property demonstrated by each question Commutative Property of Addition Distributive Property 5. Use mental math to find a 15% tip for a \$ bill. \$9.63

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