# Multiply with Decimals and Estimate Answers

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

Key stage:  KS 2

Curriculum topic:   Number: Fractions, Decimals and Percentages

Curriculum subtopic:   Solve Rounding Problems

Difficulty level:

### 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 B

A
72
B
8
C
9

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 B

A
3
B
10
C
30

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

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

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

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

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

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

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

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

• 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

## 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

## 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

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

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

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

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

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

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

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

EDDIE SAYS
2 x 9 = 18
---- OR ----

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