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Estimating Additions (2)

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

'Estimating Additions (2)' worksheet

Key stage:  KS 2

Curriculum topic:  Number: Addition and Subtraction

Curriculum subtopic:  Estimate and Check Answers

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

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

 

Example 1

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

 

326 + 567

 

Answer

326 + 567

  ↓        ↓

300 + 600 = 900

 

Example 2

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

 

150 + 415

 

Answer

150 + 415

  ↓        ↓

200 + 400 = 600

 

Remember that 150 rounds up to 200, 350 rounds up to 400, 250 rounds up to 300 etc.

Estimate the answer by rounding the numbers to the nearest hundred and then adding.

 

116 + 227

Estimate the answer by rounding the numbers to the nearest hundred and then adding.

 

274 + 218

Estimate the answer by rounding the numbers to the nearest hundred and then adding.

 

405 + 250

Estimate the answer by rounding the numbers to the nearest hundred and then adding.

 

665 + 125

Estimate the answer by rounding the numbers to the nearest hundred and then adding.

 

719 + 222

Estimate the answer by rounding the numbers to the nearest hundred and then adding.

 

556 + 198

Estimate the answer by rounding the numbers to the nearest hundred and then adding.

 

324 + 418

Estimate the answer by rounding the numbers to the nearest hundred and then adding.

 

174 + 444

Estimate the answer by rounding the numbers to the nearest hundred and then adding.

 

550 + 310

Estimate the answer by rounding the numbers to the nearest hundred and then adding.

 

896 + 121

  • Question 1

Estimate the answer by rounding the numbers to the nearest hundred and then adding.

 

116 + 227

CORRECT ANSWER
300
EDDIE SAYS

116 + 227

  ↓        ↓

100 + 200 = 300

  • Question 2

Estimate the answer by rounding the numbers to the nearest hundred and then adding.

 

274 + 218

CORRECT ANSWER
500
EDDIE SAYS

274 + 218

  ↓        ↓

300 + 200 = 500

  • Question 3

Estimate the answer by rounding the numbers to the nearest hundred and then adding.

 

405 + 250

CORRECT ANSWER
700
EDDIE SAYS

405 + 250

  ↓        ↓

400 + 300 = 700

  • Question 4

Estimate the answer by rounding the numbers to the nearest hundred and then adding.

 

665 + 125

CORRECT ANSWER
800
EDDIE SAYS

665 + 125

  ↓        ↓

700 + 100 = 800

  • Question 5

Estimate the answer by rounding the numbers to the nearest hundred and then adding.

 

719 + 222

CORRECT ANSWER
900
EDDIE SAYS

719 + 222

  ↓        ↓

700 + 200 = 900

  • Question 6

Estimate the answer by rounding the numbers to the nearest hundred and then adding.

 

556 + 198

CORRECT ANSWER
800
EDDIE SAYS

556 + 198

  ↓        ↓

600 + 200 = 800

  • Question 7

Estimate the answer by rounding the numbers to the nearest hundred and then adding.

 

324 + 418

CORRECT ANSWER
700
EDDIE SAYS

324 + 418

  ↓        ↓

300 + 400 = 700

  • Question 8

Estimate the answer by rounding the numbers to the nearest hundred and then adding.

 

174 + 444

CORRECT ANSWER
600
EDDIE SAYS

174 + 444

  ↓        ↓

200 + 400 = 600

  • Question 9

Estimate the answer by rounding the numbers to the nearest hundred and then adding.

 

550 + 310

CORRECT ANSWER
900
EDDIE SAYS

550 + 310

  ↓        ↓

600 + 300 = 900

  • Question 10

Estimate the answer by rounding the numbers to the nearest hundred and then adding.

 

896 + 121

CORRECT ANSWER
1000
EDDIE SAYS

896 + 121

  ↓        ↓

900 + 100 = 1000

---- OR ----

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