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Three-Digit Numbers: Rounding, Adding and Estimating

In this worksheet, students estimate the answer to an addition by rounding off numbers to the nearest hundred or ten.

'Three-Digit Numbers: Rounding, Adding and Estimating' worksheet

Key stage:  KS 2

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Estimate Calculations and Check Answers

Difficulty level:  

Worksheet Overview

In this worksheet children will learn about estimation by rounding numbers off to the nearest hundred or ten.



Round these numbers off to the nearest hundred so that the answer can be estimated

321 + 689   can be rounded off to  


Estimated answer is C



A     321 rounds to 300 to the nearest hundred

B     689 rounds to 700 to the nearest hundred

C     300 + 700 = 1000

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