Multiplication Properties

Multiplication Properties

5th Grade

Multiplication Properties

Associative PropertyCommutative PropertyZero Property Identity PropertyDistributive Property

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.

Associative Property

The grouping of the factors doesn’t change the answer (the parenthesis are moved).(p X q) X r = p X (q X r)(2 X 3) X 4 = 2 X (3 X 4)

Associative Property

3 X (4 X 2) = (n X 4) X 24 X (p X 7) = (4 X 1) X 75 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!

Answers are on the next slide.

Associative Property

3 X (4 X 2) = (3 X 4) X 24 X (1 X 7) = (4 X 1) X 75 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

Commutative Property

The order of the numbers doesn’t change the result (answer to the problem)p X q = q X p4 X 5 = 5 X 4

Commutative Property

9 X 3 = 3 X w56 X p = 11 X 56q X 8 = 8 X 45 X 9 = r X 5

The answers are on the next slide.

Commutative Property

9 X 3 = 3 X 956 X 11 = 11 X 564 X 8 = 8 X 45 X 9 = 9 X 5

Zero Property

When any number is multiplied with zero, the answer is zero.98,756,432 X 0 = 0

Zero Property

7,547,598,375 X c = 0758,375,937 X 0 = bz X 75,879,705 = 0

Identity Property

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

Identity Property

234 X 1 = zq X 2,567 = 2,56798,765 X d = 98,765

Answers are on the next slide.

Identity Property

234 X 1 = 2341 X 2,567 = 2,56798,765 X 1 = 98,765

Distributive Property

To multiply a sum by a number, you can multiply each addend by the number and then add the products.

6 X 23 = 6 X (20+3) = (6X20)+(6X3)

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)

The answers are on the next slide.

Distributive Property

4 X 509 = (4 X 500) + (4 X 9)6 X 310 = (6 X 300) + (6 X 10)5 X 205 = (5 X 200) + (5 X 5)

Test Yourself

1. 9 X 3 = 3 X 92. 3 X (4 X 2 ) = (3 X 4) X 23. 234 X 1 = 2344. 56 X 11 = 11 X 565. 7,547,598,375 X 0 = 06. 4 X 8 = 8 X 47. 5 X (7 X 2) = (5 X 7) X 28. 4 X 509 = (4 X 500) + (4 X

9)9. 6 X 310 = (6 X 300) + (6X

10)

10.(2 X 8) X 5 = 2 X (8 X 5)11.1 X 2,567 = 2,56712.12. 195 X 5 = (200 X 5) – (5

X 5)13.0 X 75,879,705 = 014.98,765 X 1 = 98,76515.5 X 9 = 9 X 516.5 X 205 = (5 X 200) + (5 X 5)17.4 X (1 X 7) = (4 X 1) X 718.758,375,937 X 0 = 0

Rewrite each equation with the correct answer, and write the name of the property.

Test Yourself Answers

1. 9 X 3 = 3 X 9 Commutative2. 3 X (4 X 2) = (3 X 4) X 2

Associative3. 234 X 1 = 234 Identity4. 56 X 11 = 11 X 56

Commutative5. 7,547,598,375 X 0 = 0 Zero6. 4 X 8 = 8 X 4 Commutative7. 5 X (7 X 2) = (5 X 7) X 2

Associative8. 4 X 509 = (4 X 500) + (4 X 9)

Distributive9. 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 Identity12.195 X 5 = (200 X 5) – (5 X 5)

Distributive13.0 X 75,879,705 = 0 Zero14.98,765 X 1 = 98,765 Identity15.5 X 9 = 9 X 5 Commutative16.5 X 205 = (5 X 200) + (5 X

5) Distributive17.4 X (1 X 7) = (4 X 1) X 7

Associative18.758,375,937 X 0 = 0 Zero

How did you do?

18 correct Excellent17 correct Very Good16 - 15 correct Good14 - 13 correct Passing12 – 0 correct You need more practice.