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Add Decimals and Estimate the Answer (2)

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

'Add Decimals and Estimate the Answer (2)' worksheet

Key stage:  KS 2

Curriculum topic:  Number: Addition, Subtraction, Multiplication and Division

Curriculum subtopic:  Use Estimation to Check Answers

Difficulty level:  

down

Worksheet Overview

QUESTION 1 of 10

In this worksheet children learn to 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 27

A
 + 
B
 = 
C

 

Answer

10.3 27
10
 + 
27
 = 
37

Estimate the answer by rounding the numbers to the nearest 100.

304 + 893
A
 + 
B
 = 
C

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

For example, A would be 304 to the nearest 100 and B would be 893...

Column A

Column B

C
1200
A
300
B
900

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 + 10.5
A
+
B
=
C

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

For example, A would be 11.8 to the nearest whole number and B would be 10.5...

Column A

Column B

A
23
B
12
C
11

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

68.6 + 58.7
A
+
B
=
C

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

Column A

Column B

A
69
B
59
C
128

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
56
B
116
C
60

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

57.6 + 47.8
A
+
B
=
C

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

Column A

Column B

A
58
B
106
C
48

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
22
B
101
C
79

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

26.7 + 22.6
A
+
B
=
C

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

Column A

Column B

A
23
B
50
C
27

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

46.9 + 32.5
A
+
B
=
C

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

Column A

Column B

A
80
B
47
C
33

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
126
B
31
C
95
  • Question 1

Estimate the answer by rounding the numbers to the nearest 100.

304 + 893
A
 + 
B
 = 
C

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

For example, A would be 304 to the nearest 100 and B would be 893...

CORRECT ANSWER

Column A

Column B

C
1200
A
300
B
900
  • Question 2

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
  • Question 3

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

11.8 + 10.5
A
+
B
=
C

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

For example, A would be 11.8 to the nearest whole number and B would be 10.5...

CORRECT ANSWER

Column A

Column B

A
12
B
11
C
23
  • Question 4

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

68.6 + 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
  • Question 5

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
  • Question 6

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

57.6 + 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
  • Question 7

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
  • Question 8

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

26.7 + 22.6
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
  • Question 9

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

46.9 + 32.5
A
+
B
=
C

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

CORRECT ANSWER

Column A

Column B

A
47
B
33
C
80
  • Question 10

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
---- OR ----

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