  ### Comprehensive & curriculum aligned

In this worksheet, students must estimate the answer to addition sums by rounding two numbers to the nearest ten and then adding. Key stage:  KS 2

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Estimate and Check Answers

Difficulty level:   #### Worksheet Overview

We can estimate the answer to an addition sum by rounding the numbers to the nearest ten before we add.

Example 1

Estimate the answer to the following sum by rounding the numbers to the nearest ten and then adding.

26 + 47

26 + 47

↓      ↓

30 + 50 = 80

Example 2

Estimate the answer to the following sum by rounding the numbers to the nearest ten and then adding.

94 + 75

94 + 75

↓      ↓

90 + 80 = 170

Remember that 75 rounds up to 80, 35 rounds up to 40, 25 round up to 30 etc.

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