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

Key stage:  KS 2

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Estimate and Check Answers

Difficulty level:

### 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

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

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

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

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

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

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

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

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

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

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

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

1000
EDDIE SAYS

896 + 121

↓        ↓

900 + 100 = 1000

---- OR ----

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