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Multiply Decimals

In this worksheet, students will practise multiplying decimals.

'Multiply Decimals' worksheet

Key stage:  KS 4

Curriculum topic:  

Curriculum subtopic:  

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

Multiplying decimals is relatively easy if you use the following trick...

1) Take out the decimals

2) Do the multiplication

3) Put the decimals back in

 

Example 1: 8.6 x 4

Step 1: Take out the decimal, we now have 86 x 4

Step 2: Complete the multiplication: 86 x 4 = 344

Step 3: If you look at the original question, we had one number after the decimal (8.6 x 4) so we must have one number after the decimal in the answer.

8.6 x 4 = 34.4

 

Example 1: 3.2 x 5.6

Step 1: Take out the decimal, we now have 32 x 56

Step 2: Complete the multiplication: 32 x 56 = 1792

Step 3: If you look at the original question, we had two numbers after the decimals (3.2 x 5.6) so we must have two numbers after the decimal in the answer.

3.2 x 5.6 = 17.92

How many numbers will appear after the decimal in the answer to...

3.7 x 8

0

1

2

9.1 x 2

3.74 x 6

2.5 x 4

8.31 x 15

One of the lines in this working has an error. Click correct or incorrect for each line.

3.2 x 1.8

7.5 x 2.9

8.3 x 2.4

How many numbers must be in the answer to:

9.12 x 3.6

1

2

3

4.15 x 2.83

  • Question 1

How many numbers will appear after the decimal in the answer to...

3.7 x 8

CORRECT ANSWER
1
EDDIE SAYS
The original question has one number after the decimal place so the answer must have the same.
  • Question 2

9.1 x 2

CORRECT ANSWER
18.2
EDDIE SAYS
Taking out the decimals gives 91 x 2 = 182 The original question has one number after the decimal place so again, the answer must have the same. Great focus, you're getting the hang of this!
  • Question 3

3.74 x 6

CORRECT ANSWER
EDDIE SAYS
Taking out the decimals gives 374 x 6 = 2244 Once we've added the two decimal places back in, the final answer becomes 22.44
  • Question 4

2.5 x 4

CORRECT ANSWER
10
10.0
EDDIE SAYS
Do we need to use a grid for this? A neat little trick for multiplying by 4 is to double it and then double it again.
  • Question 5

8.31 x 15

CORRECT ANSWER
EDDIE SAYS
The original question has two numbers after the decimal places so the answer must have the same. 831 x 15 = 12465 When we add back in the two decimal places in, the final answer becomes 124.65
  • Question 6

One of the lines in this working has an error. Click correct or incorrect for each line.

3.2 x 1.8

CORRECT ANSWER
EDDIE SAYS
Taking out the decimals gives 32 x 18 = 576 The original question has two numbers after the decimal places so the answer must have the same.
  • Question 7

7.5 x 2.9

CORRECT ANSWER
EDDIE SAYS
The original question has two numbers after the decimal places (one in each number) so the answer must have the same.
  • Question 8

8.3 x 2.4

CORRECT ANSWER
19.92
EDDIE SAYS
Taking out the decimals gives 93 x 24 = 1992 The original question has two numbers after the decimal places so the answer must have the same, making it 19.92.
  • Question 9

How many numbers must be in the answer to:

9.12 x 3.6

CORRECT ANSWER
3
EDDIE SAYS
The original question has three numbers (two in the first number and one in the second) after the decimal places so the answer must have the same.
  • Question 10

4.15 x 2.83

CORRECT ANSWER
11.7445
EDDIE SAYS
This one seems trickier but it's just slightly longer. Taking out the decimals gives 415 x 283 The original question has four numbers after the decimal places so the answer must have the same.
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