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**Properties of REAL Numbers**

4/21/2017 Properties of REAL Numbers

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Opposites Two real numbers that are the same distance from the origin of the real number line are opposites of each other. EXAMPLES -100 AND AND -2 4/21/2017

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Reciprocals 4/21/2017

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Absolute Value 4/21/2017

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**Commutative Property of Addition**

a + b = b + a When adding two numbers, the order of the numbers does not matter. EXAMPLES 2 + 3 = 3 + 2 (-5) + 4 = 4 + (-5) 4/21/2017

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**Commutative Property of Multiplication**

a × b = b × a When multiplying two numbers, the order of the numbers does not matter. EXAMPLES 2 × 3 = 3 × 2 (-3) × 24 = 24 × (-3) 4/21/2017

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**Associative Property of Addition**

a + (b + c) = (a + b) + c When three numbers are added, it makes no difference which two numbers are added first. EXAMPLES 2 + (3 + 5) = (2 + 3) + 5 (4 + 2) + 6 = 4 + (2 + 6) 4/21/2017

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**Associative Property of Multiplication**

a(bc) = (ab)c When three numbers are multiplied, it makes no difference which two numbers are multiplied first. EXAMPLES 2 × (3 × 5) = (2 × 3) × 5 (4 × 2) × 6 = 4 × (2 × 6) 4/21/2017

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**Distributive Property**

a(b + c) = ab + ac Multiplication distributes over addition. EXAMPLES 2 (3 + 5) = (2 × 3) + (2 × 5) (4 + 2) × 6 = (4 × 6) + (2 × 6) 4/21/2017

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**Additive Identity Property**

The additive identity property states that if 0 is added to a number, the result is that number. EXAMPLE = = 3 4/21/2017

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**Multiplicative Identity Property**

The multiplicative identity property states that if a number is multiplied by 1, the result is that number. EXAMPLE 5 × 1 = 1 × 5 = 5 4/21/2017

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**Additive Inverse Property**

The additive inverse property states that opposites add to zero. EXAMPLE 7 + (-7) = 0 and = 0 4/21/2017

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**Multiplicative Inverse Property**

4/21/2017

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PRACTICE EXERCISES 4/21/2017

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**Associative Property of Multiplication**

Identify which property justifies each of the following: 4 × (8 × 2) = (4 × 8) × 2 Associative Property of Multiplication 4/21/2017

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**COMMUTATIVE PROPERTY OF ADDITION**

Identify which property justifies each of the following: 6 + 8 = 8 + 6 COMMUTATIVE PROPERTY OF ADDITION 4/21/2017

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**ADDITIVE IDENTITY PROPERTY**

Identify which property justifies each of the following: = 12 ADDITIVE IDENTITY PROPERTY 4/21/2017

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**DISTRIBUTIVE PROPERTY**

Identify which property justifies each of the following: 5(2 + 9) = (5 × 2) + (5 × 9) DISTRIBUTIVE PROPERTY 4/21/2017

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**Multiplicative Inverse Property**

Multiplicative Inverse Property 4/21/2017

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**Commutative Property of Multiplication**

Identify which property justifies each of the following: 5 × 24 = 24 × 5 Commutative Property of Multiplication 4/21/2017

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**Additive Inverse Property**

Identify which property justifies each of the following: 18 + (-18) = 0 Additive Inverse Property 4/21/2017

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**Multiplicative Identity Property**

Identify which property justifies each of the following: -34 × 1 = -34 Multiplicative Identity Property 4/21/2017

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