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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:   Maths and Numerical Reasoning

Curriculum subtopic:   Decimals

Difficulty level:  

Worksheet Overview

In this worksheet you must 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

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