Practice Multiplying Decimals in Math

Use these practice problems to test your method after reviewing the concept explanation and worked examples.

Worksheet PDF Free Answer-key PDF Family

Quick Recap

Multiplying numbers that contain decimal points by first multiplying as if they were whole numbers, then placing the decimal point in the product based on the total number of decimal places in both factors.

Think of 0.3×0.40.3 \times 0.4 as 310×410=12100=0.12\frac{3}{10} \times \frac{4}{10} = \frac{12}{100} = 0.12. When you multiply decimals, you're working with fractions of 10, so the answer gets smaller—not bigger.

Showing a random 20 of 50 problems.

Example 1

challenge
A tile is 0.150.15 m by 0.150.15 m. How many tiles cover a 33 m by 4.54.5 m floor exactly?

Example 2

medium
Calculate 1.5×0.81.5 \times 0.8.

Example 3

easy
Calculate 0.4×30.4 \times 3.

Example 4

medium
Multiply: 2.5×1.42.5 \times 1.4.

Example 5

easy
Multiply: 2.0×0.52.0 \times 0.5.

Example 6

easy
Multiply: 0.02×50.02 \times 5.

Example 7

medium
Multiply: 1.25×0.81.25 \times 0.8.

Example 8

medium
Multiply: 1.2×0.31.2 \times 0.3.

Example 9

easy
Multiply: 0.3×0.40.3 \times 0.4.

Example 10

medium
Multiply: 4.2×1.54.2 \times 1.5.

Example 11

medium
Multiply: 0.6×1.5×0.10.6 \times 1.5 \times 0.1.

Example 12

easy
Multiply: 0.7×40.7 \times 4.

Example 13

medium
A wire is 2.42.4 m long and weighs 0.50.5 kg per meter. Find the total weight.

Example 14

hard
Find aa if a×0.4=1a \times 0.4 = 1.

Example 15

medium
Multiply: 1.5×0.2×101.5 \times 0.2 \times 10.

Example 16

medium
Calculate 2.3×1.42.3 \times 1.4.

Example 17

challenge
If a×b=0.18a \times b = 0.18 and a=0.6a = 0.6, find bb. Then state how many decimal places bb has.

Example 18

easy
Calculate 0.6×50.6 \times 5.

Example 19

hard
Without long multiplication, find 1.5×0.6×41.5 \times 0.6 \times 4.

Example 20

medium
True or false: 0.8×0.9>0.80.8 \times 0.9 > 0.8.
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