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Multiply Decimals by Whole Numbers: 1-99

In this worksheet, students practise simple multiplication of decimals.

'Multiply Decimals by Whole Numbers: 1-99' worksheet

Key stage:  KS 2

Curriculum topic:   Number: Multiplication and Division

Curriculum subtopic:   Multiply/Divide Using Decimals

Difficulty level:  

Worksheet Overview

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 = ?

 

Answer

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

 

Multiplying decimals                                     

 

 

 

 Multiplying decimals
 

 

Answers are both 24.8

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 = ?

CORRECT ANSWER
 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 = ?

CORRECT ANSWER
 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 = ?

CORRECT ANSWER
 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 = ?

CORRECT ANSWER
 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 = ?

CORRECT ANSWER
 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 = ?

CORRECT ANSWER
 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 = ?

CORRECT ANSWER
 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 = ?

CORRECT ANSWER
 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 = ?

CORRECT ANSWER
 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 = ?

CORRECT ANSWER
 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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