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Estimating Additions (1)

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

'Estimating Additions (1)' worksheet

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

 

Answer

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

 

Answer

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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