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Multiply with Decimals and Estimate Answers

In this worksheet, students perform multiplications by rounding numbers before carrying out the calculation.

'Multiply with Decimals and Estimate Answers' worksheet

Key stage:  KS 2

Curriculum topic:  Number: Fractions, Decimals and Percentages

Curriculum subtopic:  Solve Rounding Problems

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

We can estimate the answers to these multiplications by rounding both decimals to the nearest whole numbers before carrying out the multiplication.

 

Example:

4.11 × 8.75 can be estimated as

4 × 9 = 36

Estimate the answers to the following problems by rounding both decimals to the nearest whole numbers first and then multiplying.

 

7.71  ×  8.93  = A  × B  =  C

Column A

Column B

A
8
B
9
C
72

Estimate the answers to the following problems by rounding both decimals to the nearest whole numbers first and then multiplying.

 

10.3  ×  3.3  =   A  ×  B  =  C

Column A

Column B

A
30
B
3
C
10

Estimate the answers to the following problems by rounding both decimals to the nearest whole numbers first and then multiplying.

 

9.66  ×  5.16  =   A  ×  B  =   C

 Answer
A
B
C

Estimate the answers to the following problems by rounding both decimals to the nearest whole numbers first and then multiplying.

 

4.68  ×  4.05  =   A  ×  B  =   C

 Answer
A
B
C

Estimate the answers to the following problems by rounding both decimals to the nearest whole numbers first and then multiplying.

 

4.53  ×  9.37  =   A  ×  =   C

 Answer
A
B
C

Estimate the answers to the following problems by rounding both decimals to the nearest whole numbers first and then multiplying.

 

9.05  ×  5.83  =   A  ×  B  =   C

 Answer
A
B
C

Estimate the answers to the following problems by rounding both decimals to the nearest whole numbers first and then multiplying.

 

8.78  ×  10.01  =   A  ×  B  =  C

 Answer
A
B
C

Estimate the answers to the following problems by rounding both decimals to the nearest whole numbers first and then multiplying.

 

8.87  ×  1.36  =  A  ×  B  =   C

 Answer
A
B
C

Estimate the answers to the following problems by rounding both decimals to the nearest whole numbers first and then multiplying.

 

1.73  ×  3.06  =   × B  =   C

 Answer
A
B
C

Estimate the answers to the following problems by rounding both decimals to the nearest whole numbers first and then multiplying.

 

2.43  ×  9.31 =   A  ×  B  =   C

 Answer
A
B
C
  • Question 1

Estimate the answers to the following problems by rounding both decimals to the nearest whole numbers first and then multiplying.

 

7.71  ×  8.93  = A  × B  =  C

CORRECT ANSWER

Column A

Column B

A
8
B
9
C
72
EDDIE SAYS
8 x 9 = 72
  • Question 2

Estimate the answers to the following problems by rounding both decimals to the nearest whole numbers first and then multiplying.

 

10.3  ×  3.3  =   A  ×  B  =  C

CORRECT ANSWER

Column A

Column B

A
10
B
3
C
30
EDDIE SAYS
10 x 3 = 30
  • Question 3

Estimate the answers to the following problems by rounding both decimals to the nearest whole numbers first and then multiplying.

 

9.66  ×  5.16  =   A  ×  B  =   C

CORRECT ANSWER
 Answer
A
B
C
EDDIE SAYS
10 x 5 = 50
  • Question 4

Estimate the answers to the following problems by rounding both decimals to the nearest whole numbers first and then multiplying.

 

4.68  ×  4.05  =   A  ×  B  =   C

CORRECT ANSWER
 Answer
A
B
C
EDDIE SAYS
5 x 4 = 20
  • Question 5

Estimate the answers to the following problems by rounding both decimals to the nearest whole numbers first and then multiplying.

 

4.53  ×  9.37  =   A  ×  =   C

CORRECT ANSWER
 Answer
A
B
C
EDDIE SAYS
5 x 9 = 45
  • Question 6

Estimate the answers to the following problems by rounding both decimals to the nearest whole numbers first and then multiplying.

 

9.05  ×  5.83  =   A  ×  B  =   C

CORRECT ANSWER
 Answer
A
B
C
EDDIE SAYS
9 x 6 = 54
  • Question 7

Estimate the answers to the following problems by rounding both decimals to the nearest whole numbers first and then multiplying.

 

8.78  ×  10.01  =   A  ×  B  =  C

CORRECT ANSWER
 Answer
A
B
C
EDDIE SAYS
9 x 10 = 90
  • Question 8

Estimate the answers to the following problems by rounding both decimals to the nearest whole numbers first and then multiplying.

 

8.87  ×  1.36  =  A  ×  B  =   C

CORRECT ANSWER
 Answer
A
B
C
EDDIE SAYS
9 x 1 = 9
  • Question 9

Estimate the answers to the following problems by rounding both decimals to the nearest whole numbers first and then multiplying.

 

1.73  ×  3.06  =   × B  =   C

CORRECT ANSWER
 Answer
A
B
C
EDDIE SAYS
2 x 3 = 6
  • Question 10

Estimate the answers to the following problems by rounding both decimals to the nearest whole numbers first and then multiplying.

 

2.43  ×  9.31 =   A  ×  B  =   C

CORRECT ANSWER
 Answer
A
B
C
EDDIE SAYS
2 x 9 = 18
---- OR ----

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