Multiply decimals

Multiply by 10's

100

23.3x10³=

23300

200

10²x2.35=

235

300

10² x 38,256.77 =

3,825,677

400

An author sells books on a website for $8.95 each. A teacher orders 10 books how much does she pay?

$89.50

500

A chromosome 13 in the human body contains a DNA molecule that is about 3.19 centimeters long.  What is the length of 1,000 of these molecules?

3,190 cm

Multiply by 1/10, 1/100, 1/1000

100

0.01 x 72.3 =

0.723

200

0.1 x 73,540 =

7354

300

Four different boxes weigh  a total of 245 pounds. 1 box weighs 1/100 of the total amount. How much does this box weigh?

2.45

400

1/100 x 8461 =

84.61

500

A pence is a unit of currency that is 1/100 of one British pound. One British pound is worth about $1.30 US. How much is one pence worth in US currency?

$0.013

Multiply decimals by a whole number

100

2.3 x 14 =

32.2

200

24.1 x 82 =

1976.2

300

5.40 x 28 =

151.20

400

Every minute, 6.8 gallons of water flow from a garden hose into a pool. Find the amount of water in the pool after 32 minutes. 

217.6 gallons

500

Kennard rides his bike 3.25 miles each day to get to and from school for the first 34 days of school. How many miles does he ride in those 34 days?

110.5

Multiply a decimal by a decimal

100

7.3 x 3.6 =

26.28

200

12.8 x 7.3 =

93.44

300

4.79 x 6.2 =

29.698

400

What is the area of a rectangle with a length of 8.3 cm and a width of 3.9 cm?

32.37 sq cm

500

A zoo is planning a new building for the penguin exhibit. First, they made a model that was 1.3 meters tall. Then, they made a more detailed model that was 1.5 times as tall as the first model. The building will be 2.5 times as tall as the height of the detailed model. What will be the height of the building?

4.875 meters