1-4 Properties and Mental Math 9/20/11 Warm Up Find each sum or product. 1. 17 + 15 2. 29 + 39 3. 8(24) 4. 7(12) 5. 3(91) 6. 6(15) 32 68 192 84 273 90.

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1-4 Properties and Mental Math 9/20/11 Warm Up Find each sum or product (24) 4. 7(12) 5. 3(91) 6. 6(15)

1-4 Properties and Mental Math Vocabulary Commutative Property = x 2 = 2 x 15

1-4 Properties and Mental Math Vocabulary Associative Property (17 + 2) + 9 = 17 + (2 + 9) (12 x 2) x 4 = 12 x (2 x 4)

1-4 Properties and Mental Math Simplify Look for sums that are multiples of Use the Commutative Property (17 + 3) + (5 + 15) Use mental math to add Use the Associative Property to make groups of compatible numbers.

1-4 Properties and Mental Math Simplify 4  13  5. 4  13  5 Look for products that are multiples of Use the Commutative Property. 13  4  5 13  (4  5) Use mental math to multiply. 13  20 Use the Associative Property to group compatible numbers.

1-4 Properties and Mental Math Simplify Look for sums that are multiples of Use the Commutative Property (12 + 8) + (5 + 5) Use mental math to add Use the Associative Property to make groups of compatible numbers.

1-4 Properties and Mental Math Vocabulary Distributive Property 6(10 + 4) = (6 x 10) + (6 x 4)

1-4 Properties and Mental Math Use the Distributive Property to find the product. 6  35 6  35 = 6  (30 + 5) “Break apart” 35 into = 210 Use the Distributive Property. = (6  30) + (6  5) Use mental math to add. = Use mental math to multiply.

1-4 Properties and Mental Math Use the Distributive Property to find the product. 9  87 9  87 = 9  (80 + 7) “Break apart” 87 into = 783 Use the Distributive Property. = (9  80) + (9  7) Use mental math to add. = Use mental math to multiply.

1-4 Properties and Mental Math Use the Distributive Property to find the product. 4  27 4  27 = 4  (20 + 7) “Break apart” 27 into = 108 Use the Distributive Property. = (4  20) + (4  7) Use mental math to add. = Use mental math to multiply.

1-4 Properties and Mental Math Lesson Quiz Simplify  5  Use the Distributive Property to find each product    

1-4 Properties and Mental Math Homework Page 24-25: even