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Multiplying Decimals & Properties of Multiplication Christine Berg Edited By V T Hamilton.

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Presentation on theme: "Multiplying Decimals & Properties of Multiplication Christine Berg Edited By V T Hamilton."— Presentation transcript:

1 Multiplying Decimals & Properties of Multiplication Christine Berg Edited By V T Hamilton

2 Step 1: Multiply as if the factors were whole numbers

3 Step 1: 8.5 X next…..

4 Step 2: Count the total decimals places in the factors

5 Step 1: 8.5 X next…..

6 Step 3: Give the product the total decimal places of the factors

7 Step 1: 8.5 X

8 Try These: x 0.5 x.05

9 Answers: x 0.5 x.05 = 2.40 =

10 Properties of Multiplication

11 Identity Property The product of 1 and a number (a) is the number (a) 1(a) = a

12 Examples 1 (b) = b 1 x 42 = 42

13 Zero Property The product of 0 and a number (a) is 0 0 (a) = 0

14 Examples 0 (b) = 0 0 x 67 = 0

15 Commutative Property Changing the order of the factors does not change the answer

16 Examples a ( b ) = b ( a ) 5 x 2 = 2 x 5

17 Associative Property Changing the grouping of factors does not change the answer

18 Examples ( a b ) c = a ( b c ) ( 3 x 2 ) x 4 = 3 x ( 2 x 4 )

19 Try These: Identify the property ( x y ) z = x ( y z ) 0 x 4 = 0

20 Answers: ( x y ) z = x ( y z ) Associative Property of x 0 x 4 = 0 Zero Property


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