multiplying decimals. to multiply: you do not line up the factors by the decimal. instead, place the...
DESCRIPTION
Example: 5.63 x x two one three.TRANSCRIPT
Multiplying Decimals
To Multiply:• You do not line up the factors by the decimal.• Instead, place the number with more digits on top.• Line up the other number underneath, at the right.• Multiply• Count the number of decimal places (from the
right) in each factor.• Use the total number of decimal places in your
two factors to place the decimal in your product.
Example: 5.63 x 3.7
5.633.7x
1
2
4
4
39098
1
16+13
1
8
1
0
1
2
two
one
three.
Example: 0.53 x 2.6182.618 has more digits (4) than 0.53 (3), so it goes on top.
2.6180.53x
4
2
58
1
700
4
90
3
13000000+457
1
831
Decimal Places
three
two
five.
Try This: 6.5 x 15.3
15.36.5x
5
1
6
2
708
1
1
3
9+54
1
99
one
one
two.
Multiplication PropertiesCommutative Property of Multiplication: Factors can be multiplied in any order.
Example: 12 x 5 = 5 x 12
Associative Property of Multiplication: Factors can be grouped in any way.
Example: (2 x 3) x 5 = 2 x (3 x 5)
Identity Property of Multiplication: The product of any number and one is that number.
Example: 18 x 1 = 18