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Multiply & Divide Decimals in Base 10
供稿人: Moehle

To multiply a decimal by a power of a 10,

move the decimal point to the

Left
Right

To divide a decimal by a power of a 10,

move the decimal point to the

Right

 Left

To divide a decimal by  100,

move the decimal point ________ place values.

one

 two
three

To multiply a decimal by a 1000,

move the decimal point ________ place values.

one

 two
three
2.5 × 10 = 
673 ÷ 100 =
523 ÷ 10 =
62.8 × 100 =
73.568 × 100 =
What math operation does a fraction indicate?
Division
Multiplication
Subtraction
Addition
310
10
=
10
84
=
100
73
=
0.
1000
2
=
0.

Think about setting up equivalent rates to solve

the problem. 

$11.50
2 lbs

If 2 pounds of cheese cost 

$11.50, then how much will

20 pounds cost?

multiply by 10
multiply by 10
=
$
20 lbs
.00

If 4 pounds of coffee cost

 $21.95, how much

will 40 pounds cost?

$21.95
4 lbs
=
$
40 lbs

If 50 pounds of coffee cost

 $274.30, how much

will 5 pounds cost?

$274.30
50 lbs
=
$
5 lbs

If 30 pounds of cheese cost 

$172.50, then how much will

3 pounds cost?

$17.50
30 lbs
=
$
3 lbs
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