# Multiply Decimals by Whole Numbers: 1-99

In this worksheet, students practise simple multiplication of decimals.

Key stage:  KS 2

Curriculum topic:   Number: Multiplication and Division

Curriculum subtopic:   Multiply/Divide Using Decimals

Difficulty level:

### QUESTION 1 of 10

This activity is an introduction to multiplication of simple decimals.

Example

Complete the following multiplications.

We know that 31 x 8 = 248

What is:

3.1 x 8 = ?

and

31 x 0.8 = ?

When a number in the question is divided by 10, we must also divide the answer by 10.

Complete the following multiplications.

We know that 89 x 7 = 623

What is:

8.9 x 7 = ?

and

89 x 0.7 = ?

 Answer 8.9 x 7 89 x 0.7

Complete the following multiplications.

We know that 91 x 1 = 91

What is:

9.1 x 1 = ?

and

91 x 0.1 = ?

 Answer 9.1 x 1 91 x 0.1

Complete the following multiplications.

We know that 15 x 8 = 120

What is:

1.5 x 8 = ?

and

15 x 0.8 = ?

 Answer 1.5 x 8 15 x 0.8

Complete the following multiplications.

We know that 80 x 7 = 560

What is:

8 x 70 = ?

and

80 x 0.7 = ?

 Answer 8 x 70 80 x 0.7

Complete the following multiplications.

We know that 23 x 3 = 69

What is:

2.3 x 3 = ?

and

23 x 0.3 = ?

 Answer 2.3 x 3 23 x 0.3

Complete the following multiplications.

We know that 27 x 3 = 81

What is:

2.7 x 3 = ?

and

27 x 30 = ?

 Answer 2.7 x 3 27 x 30

Complete the following multiplications.

We know that 54 x 4 = 216

What is:

5.4 x 4 = ?

and

54 x 0.4 = ?

 Answer 5.4 x 4 54 x 0.4

Complete the following multiplications.

We know that 24 x 1 = 24

What is:

24 x 10 = ?

and

24 x 0.1 = ?

 Answer 24 x 10 24 x 0.1

Complete the following multiplications.

We know that 20 x 7 = 140

What is:

2 x 70 = ?

and

20 x 0.7 = ?

 Answer 2 x 70 20 x 0.7

Complete the following multiplications.

We know that 55 x 3 = 165

What is:

5.5 x 3 = ?

and

55 x 0.3 = ?

 Answer 5.5 x 3 55 x 0.3
• Question 1

Complete the following multiplications.

We know that 89 x 7 = 623

What is:

8.9 x 7 = ?

and

89 x 0.7 = ?

 Answer 8.9 x 7 89 x 0.7
EDDIE SAYS
In the first problem, multiply by 8 and 9 tenths and in the second problem multiply by 7 tenths, so the answer for both problems moves one decimal place to 62.3
• Question 2

Complete the following multiplications.

We know that 91 x 1 = 91

What is:

9.1 x 1 = ?

and

91 x 0.1 = ?

 Answer 9.1 x 1 91 x 0.1
EDDIE SAYS
In the first problem, multiply by 9 and 1 tenth and in the second problem multiply by 1 tenth, so the answer for both problems moves one decimal place to 9.1
• Question 3

Complete the following multiplications.

We know that 15 x 8 = 120

What is:

1.5 x 8 = ?

and

15 x 0.8 = ?

 Answer 1.5 x 8 15 x 0.8
EDDIE SAYS
In the first problem, multiply by 1 and 8 tenths and in the second problem multiply by 8 tenth, so the answer for both problems moves one decimal place to 12
• Question 4

Complete the following multiplications.

We know that 80 x 7 = 560

What is:

8 x 70 = ?

and

80 x 0.7 = ?

 Answer 8 x 70 80 x 0.7
EDDIE SAYS
There isn't a decimal in 8 x 70. For 80 x 7 tenths, the decimal moves one place to 56
• Question 5

Complete the following multiplications.

We know that 23 x 3 = 69

What is:

2.3 x 3 = ?

and

23 x 0.3 = ?

 Answer 2.3 x 3 23 x 0.3
EDDIE SAYS
In the first problem, multiply by 2 and 3 tenths and in the second problem multiply by 3 tenths, so the answer for both problems moves one decimal place to 6.9
• Question 6

Complete the following multiplications.

We know that 27 x 3 = 81

What is:

2.7 x 3 = ?

and

27 x 30 = ?

 Answer 2.7 x 3 27 x 30
EDDIE SAYS
In the first problem, multiply by 2 and 7 tenths so the answer moves one decimal place to 8.1
• Question 7

Complete the following multiplications.

We know that 54 x 4 = 216

What is:

5.4 x 4 = ?

and

54 x 0.4 = ?

 Answer 5.4 x 4 54 x 0.4
EDDIE SAYS
In the first problem, multiply by 5 and 4 tenths and in the second problem multiply by 4 tenths, so the answer for both problems moves one decimal place to 21.6
• Question 8

Complete the following multiplications.

We know that 24 x 1 = 24

What is:

24 x 10 = ?

and

24 x 0.1 = ?

 Answer 24 x 10 24 x 0.1
EDDIE SAYS
In the second problem multiply by 1 tenth, so the answer moves one decimal place to 2.4
• Question 9

Complete the following multiplications.

We know that 20 x 7 = 140

What is:

2 x 70 = ?

and

20 x 0.7 = ?

 Answer 2 x 70 20 x 0.7
EDDIE SAYS
In the second problem multiply by 7 tenths, so the answer moves one decimal place to 14
• Question 10

Complete the following multiplications.

We know that 55 x 3 = 165

What is:

5.5 x 3 = ?

and

55 x 0.3 = ?

 Answer 5.5 x 3 55 x 0.3
EDDIE SAYS
In the first problem, multiply by 5 and 5 tenths and in the second problem multiply by 3 tenths, so the answer for both problems moves one decimal place to 16.5
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