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Published byBarry Miller Modified over 8 years ago

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To identify basic multiplication facts and properties

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MENTAL MATH Find each sum: 1. 2 + 2 + 2 + 2 2. 5 + 5 + 5 3. 8 + 8 + 8 +8 4. 9 + 9 + 9 5. 4 + 4 + 4 + 4 + 4 6. 7 + 7 + 7 + 7 + 7 7. 1 + 1 + 1 + 1 + 1 + 1 + 1

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Multiplication Properties Commutative Property Associative Property Identity Property Zero Property Distributive Property

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Why Should you Learn about the Properties of Multiplication? It helps you solve problems without working them out. It helps with mental math. It makes understanding math easier.

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Commutative Property The order of the numbers doesn’t change the result (answer to the problem) 6 x 4 = 4 x 6

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Commutative Property 9 X 3 = 3 X w 56 X p = 11 X 56 q X 8 = 8 X 4 5 X 9 = r X 5

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Commutative Property 9 X 3 = 3 X 9 56 X 11 = 11 X 56 4 X 8 = 8 X 4 5 X 9 = 9 X 5

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Associative Property The grouping of the factors doesn’t change the answer. (4 x 2) x 3 = 24 4 x (2 x 3) = 24 (5 x 1) x 6 = 30 5 x (1 x 6) = 30

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Associative Property 3 x (4 x 2) = (n x 4) x 2 4 x (p x 7) = (4 x 1) x 7 5 x (7 x 2) = (5 x 7) x n (2 x z) x 5 = 2 x (8 x 5) Is this Associative? 5 X (n X 2) = (2 X 5) X 5 Watch out!

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Associative Property 3 X (4 X 2) = (3 X 4) X 2 4 X (1 X 7) = (4 X 1) X 7 5 X (7 X 2) = (5 X 7) X 2 (2 X 8) X 5 = 2 X (8 X 5) Is this Associative? No, it’s commutative. 5 X (5 X 2) = (2 X 5) X 5

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Identity Property Any number multiplied by 1 will give you the original number. 23,487 X 1 = 23,487

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Identity Property 234 X 1 = z q X 2,567 = 2,567 98,765 X d = 98,765 Answers are on the next slide.

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Identity Property 234 X 1 = 234 1 X 2,567 = 2,567 98,765 X 1 = 98,765

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Zero Property When any number is multiplied with zero, the answer is zero. If one factor is O, the product is O. Example: 98,756,432 X 0 = 0

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Zero Property 7,547,598,375 X o = 0 758,375,937 X 0 = 0 0 X 75,879,705 = 0

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Distributive Property Multiplying the sum (or difference) by a number is the same as multiplying each number in the sum (or difference) by the number and adding (or subtracting) the product. 9 X (20 - 3) = (9 X 20) – (9 X 3) 8 X (40 + 5) = (8 X 40) + (8 X 5) 8 X 45 = (8 X 40) + (8 X 5)

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Distributive Property 4 X 509 = (4 X 500) + (4 X m) 6 X 310 = (6 X n) + (6 X 10) s X 205 = (5 X 200) + (5 X 5) 195 X 5 = (200 X 5) – (5 X t)

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Test Yourself 1. 9 X 3 = 3 X w 2. 3 X (4 X 2 ) = (n X 4) X 2 3. 234 X 1 = z 4. 56 X p = 11 X 56 5. 7,547,598,375 X c = 0 6. q X 8 = 8 X 4 7. 5 X (7 X 2) = (5 X 7) X n 8. 4 X 509 = (4 X 500) + (4 X m) 9. 6 X 310 = (6 X n) + (6 X 10) 10. (2 X z) X 5 = 2 X (8 X 5) 11. q X 2,567 = 2,567 12. 12. 195 X 5 = (200 X 5) – (5 X t) 13. z X 75,879,705 = 0 14. 98,765 X d = 98,765 15. 5 X 9 = r X 5 16. s X 205 = (5 X 200) + (5 X 5) 17. 4 X (p X 7) = (4 X 1) X 7 18. 758,375,937 X 0 = b Rewrite each equation with the correct answer, and write the name of the property.

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Test Yourself Answers 1. 9 X 3 = 3 X 9 Commutative 2. 3 X (4 X 2) = (3 X 4) X 2 Associative 3. 234 X 1 = 234 Identity 4. 56 X 11 = 11 X 56 Commutative 5. 7,547,598,375 X 0 = 0 Zero 6. 4 X 8 = 8 X 4 Commutative 7. 5 X (7 X 2) = (5 X 7) X 2 Associative 8. 4 X 509 = (4 X 500) + (4 X 9) Distributive 9. 6 X 310 = (6 X 300) + (6 X 10) Distributive 10. (2 X 8) X 5 = 2 X (8 X 5) Associative 11. 1 X 2,567 = 2,567 Identity 12. 195 X 5 = (200 X 5) – (5 X 5) Distributive 13. 0 X 75,879,705 = 0 Zero 14. 98,765 X 1 = 98,765 Identity 15. 5 X 9 = 9 X 5 Commutative 16. 5 X 205 = (5 X 200) + (5 X 5) Distributive 17. 4 X (1 X 7) = (4 X 1) X 7 Associative 18. 758,375,937 X 0 = 0 Zero

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How did you do? 18 correctExcellent 17 correctVery Good 16 - 15 correct Good 14 - 13 correct Passing 12 – 0 correct You need more practice.

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