Warm Up Evaluate  3 – (3 – 1) ÷ (3 + 2) 10

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Warm Up Evaluate. 1. 2 + 5  3 – 7 2. 5(3 – 1) ÷ (3 + 2) 10 3. (4 + 1)2 – 8 ÷ 2 4. 12 ÷ 3  6 – 20 10 2 21 4 HWK: p 6

EQ: How do I identify properties of rational numbers and use them to simplify numerical expressions? M7P1c Adapt and apply a variety of appropriate strategies to solve problems

Vocabulary Commutative Property Associative Property Identity Property Distributive Property

Tell which property is represented. A. (2  6)  1 = 2  (6  1) Additional Example 1: Identifying Properties of Addition and Multiplication Tell which property is represented. A. (2  6)  1 = 2  (6  1) B. 3 + 0 = 3 C. 7 + 9 = 9 + 7 Associative Property Identity Property Commutative Property

Tell which property is represented. A. 7  1 = 7 Check It Out: Example 1 Tell which property is represented. A. 7  1 = 7 B. 3 + 4 = 4 + 3 C. (5  1)  2 = 5  (1  2) Identity Property Commutative Property Associative Property

Additional Example 2: Using Properties to Simplify Expressions Simplify each expression. Justify each step. A. 21 + 16 + 9 B. 20  9  5 21 + 16 + 9 = 16 + 9 + 21 Commutative Property. = 16 + (9 + 21) Associative Property. = 16 + 30 Add. = 46 20  9  5 = 20  5  9 Commutative Property. = 20  (5  9) Associative Property. = 20  45 Multiply. = 900

Check It Out: Example 2A & B Simplify each expression. Justify each step. A. 17 + 14 + 3 B. 12  3  5 17 + 14 + 3 = 14 + 17 + 3 Commutative Property. = 14 + (17 + 3) Associative Property. = 14 + 20 Add. = 34 12  3  5 = 3  5  12 Commutative Property. = 3  (5  12) Associative Property. = 3  60 Multiply. = 180

You can use the Distributive Property to multiply numbers mentally by breaking apart one of the numbers and writing it as a sum or difference.

Use the Distributive Property to find 6(54). Method 1: Additional Example 3: Using the Distributive Property to Multiply Mentally Use the Distributive Property to find 6(54). Method 1: Method 2: 6(54) = 6(50 + 4) Rewrite 54 as 50 + 4. Use the Distributive Property. = (6  50) + (6  4) = 300 + 24 Multiply. = 324 Add. 6(54) = 6(60 – 6) Rewrite 54 as 60 – 6. = (6  60) – (6  6) Use the Distributive Property. Multiply. = 360 - 36 = 324 Subtract.

Use the Distributive Property to find 8(19). Method 1: Check It Out: Example 3 Use the Distributive Property to find 8(19). Method 1: Method 2: 8(19) = 8(10 + 9) Rewrite 19 as 10 + 9. Use the Distributive Property. = (8  10) + (8  9) = 80 + 72 Multiply. = 152 Add. 8(19) = 8(20 – 1) Rewrite 19 as 20 – 1. = (8  20) – (8  1) Use the Distributive Property. Multiply. = 160 – 8 = 152 Subtract.

TOTD Identity Property Associative Property Commutative Property 1,200 Tell which property is represented. 1. 17  1 = 17 2. (12 + 14) + 5 = 12 + (14 + 5) 3. 2  16 = 16  2 Simplify each expression. Justify each step. 4. 4  12  25 5. 48 + (15 + 2) Use the Distributive Property to find each product. 6. 6  (12 + 5) 7. (20 – 7)  9 Identity Property Associative Property Commutative Property 1,200 65 102 117

Problem of the Day Daniel usually buys 6 bottles of water and 3 apples when he goes to the grocery store. Next time he goes, he will buy three times as many of each. How many items will Daniel buy? 27