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Estimate the Answer to an Addition by Rounding

In this worksheet, students round decimal numbers to the nearest whole numbers in order to estimate the answer to an addition.

'Estimate the Answer to an Addition by Rounding' 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

In this worksheet, round decimal numbers to the nearest whole numbers and then estimate the answer to an addition.

 

Example

Estimate the answer to the addition by first rounding both decimals to the nearest whole numbers.

 

10.3 26.9

A
 + 
B
 = 
C

 

Answer

10.3 is less than 10.5 so it rounds down to 10.

26.9 is more than 26.5 so it rounds up to 27 (remember that .5 numbers go up).

 

Then add 10 + 27 to get 37.

 

10.3 26.9
10
 + 
27
 = 
37

Estimate the answer to the addition by first rounding both decimals to the nearest whole numbers.

 

27.8 + 15.4

A
 + 
B
 = 
C

 

Remember to put your answers in the same sequence as the question!

For example, A would be 27.8 to the nearest whole number and B would be 15.4...

Column A

Column B

A
28
B
43
C
15

Estimate the answer to the addition by first rounding both decimals to the nearest whole numbers.

 

11.8 + 10.4

A
 + 
B
 = 
C

 

Remember to put your answers in the same sequence as the question!

 

Column A

Column B

A
12
B
10
C
22

Estimate the answer to the addition by first rounding both decimals to the nearest whole numbers.

 

68.9 + 58.7

A
 + 
B
 = 
C

 

Remember to put your answers in the same sequence as the question!

Column A

Column B

A
69
B
128
C
59

Estimate the answer to the addition by first rounding both decimals to the nearest whole numbers.

 

59.7 + 56.4

A
 + 
B
 = 
C

 

Remember to put your answers in the same sequence as the question!

Column A

Column B

A
116
B
60
C
56

Estimate the answer to the addition by first rounding both decimals to the nearest whole numbers.

 

57.7 + 47.8

A
 + 
B
 = 
C

 

Remember to put your answers in the same sequence as the question!

Column A

Column B

A
48
B
58
C
106

Estimate the answer to the addition by first rounding both decimals to the nearest whole numbers.

 

79.1 + 22.1

A
 + 
B
 = 
C

 

Remember to put your answers in the same sequence as the question!

Column A

Column B

A
79
B
22
C
101

Estimate the answer to the addition by first rounding both decimals to the nearest whole numbers.

 

26.7 + 22.9

A
 + 
B
 = 
C

 

Remember to put your answers in the same sequence as the question!

Column A

Column B

A
23
B
27
C
50

Estimate the answer to the addition by first rounding both decimals to the nearest whole numbers.

 

46.9 + 32.4

A
 + 
B
 = 
C

 

Remember to put your answers in the same sequence as the question!

Column A

Column B

A
47
B
32
C
79

Estimate the answer to the addition by first rounding both decimals to the nearest whole numbers.

 

94.9 + 31  

A
 + 
B
 = 
C

 

Remember to put your answers in the same sequence as the question!

Column A

Column B

A
95
B
126
C
31

Estimate the answer to the addition by first rounding both decimals to the nearest whole numbers.

 

51.2 + 47.3

A
 + 
B
 = 
C

 

Remember to put your answers in the same sequence as the question!

Column A

Column B

A
98
B
51
C
47
  • Question 1

Estimate the answer to the addition by first rounding both decimals to the nearest whole numbers.

 

27.8 + 15.4

A
 + 
B
 = 
C

 

Remember to put your answers in the same sequence as the question!

For example, A would be 27.8 to the nearest whole number and B would be 15.4...

CORRECT ANSWER

Column A

Column B

A
28
B
15
C
43
EDDIE SAYS
27.8 rounds to 28 to the nearest whole number.
15.4 rounds to 15 to the nearest whole number.
  • Question 2

Estimate the answer to the addition by first rounding both decimals to the nearest whole numbers.

 

11.8 + 10.4

A
 + 
B
 = 
C

 

Remember to put your answers in the same sequence as the question!

 

CORRECT ANSWER

Column A

Column B

A
12
B
10
C
22
EDDIE SAYS
11.8 rounds to 12 to the nearest whole number.
10.4 rounds to 10 to the nearest whole number.
  • Question 3

Estimate the answer to the addition by first rounding both decimals to the nearest whole numbers.

 

68.9 + 58.7

A
 + 
B
 = 
C

 

Remember to put your answers in the same sequence as the question!

CORRECT ANSWER

Column A

Column B

A
69
B
59
C
128
EDDIE SAYS
68.9 rounds to 69 to the nearest whole number.
58.7 rounds to 59 to the nearest whole number.
  • Question 4

Estimate the answer to the addition by first rounding both decimals to the nearest whole numbers.

 

59.7 + 56.4

A
 + 
B
 = 
C

 

Remember to put your answers in the same sequence as the question!

CORRECT ANSWER

Column A

Column B

A
60
B
56
C
116
EDDIE SAYS
59.7 rounds to 60 to the nearest whole number.
56.4 rounds to 56 to the nearest whole number.
  • Question 5

Estimate the answer to the addition by first rounding both decimals to the nearest whole numbers.

 

57.7 + 47.8

A
 + 
B
 = 
C

 

Remember to put your answers in the same sequence as the question!

CORRECT ANSWER

Column A

Column B

A
58
B
48
C
106
EDDIE SAYS
57.7 rounds to 58 to the nearest whole number.
47.8 rounds to 48 to the nearest whole number.
  • Question 6

Estimate the answer to the addition by first rounding both decimals to the nearest whole numbers.

 

79.1 + 22.1

A
 + 
B
 = 
C

 

Remember to put your answers in the same sequence as the question!

CORRECT ANSWER

Column A

Column B

A
79
B
22
C
101
EDDIE SAYS
79.1 rounds to 79 to the nearest whole number.
22.1 rounds to 22 to the nearest whole number.
  • Question 7

Estimate the answer to the addition by first rounding both decimals to the nearest whole numbers.

 

26.7 + 22.9

A
 + 
B
 = 
C

 

Remember to put your answers in the same sequence as the question!

CORRECT ANSWER

Column A

Column B

A
27
B
23
C
50
EDDIE SAYS
26.7 rounds to 27 to the nearest whole number.
22.9 rounds to 23 to the nearest whole number.
  • Question 8

Estimate the answer to the addition by first rounding both decimals to the nearest whole numbers.

 

46.9 + 32.4

A
 + 
B
 = 
C

 

Remember to put your answers in the same sequence as the question!

CORRECT ANSWER

Column A

Column B

A
47
B
32
C
79
EDDIE SAYS
46.9 rounds to 47 to the nearest whole number.
32.4 rounds to 32 to the nearest whole number.
  • Question 9

Estimate the answer to the addition by first rounding both decimals to the nearest whole numbers.

 

94.9 + 31  

A
 + 
B
 = 
C

 

Remember to put your answers in the same sequence as the question!

CORRECT ANSWER

Column A

Column B

A
95
B
31
C
126
EDDIE SAYS
94.9 rounds to 95 to the nearest whole number.
31 is already 31 to the nearest whole number.
  • Question 10

Estimate the answer to the addition by first rounding both decimals to the nearest whole numbers.

 

51.2 + 47.3

A
 + 
B
 = 
C

 

Remember to put your answers in the same sequence as the question!

CORRECT ANSWER

Column A

Column B

A
51
B
47
C
98
EDDIE SAYS
51.2 rounds to 51 to the nearest whole number.
47.3 rounds to 47 to the nearest whole number.
---- OR ----

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