Year 3 Estimating Sums, Differences and Products Worksheet — Level 1 — Answers
Answer sheet with worked solutions for the Year 3 place value worksheet.
Success TutoringWorksheetsAnswer sheetYear 3 · Mathematics · Place ValueYear 3 Estimating Sums, Differences and Products Worksheet — Level 1 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 96 − 38 by rounding each number to the nearest 10.
Answer: 60
- 96 rounds to 100; 38 rounds to 40
- 100 − 40 = 60
The exact answer is 58, close to the estimate.
2.Estimate 52 + 59 by rounding each number to the nearest 10.
Answer: 110
- 52 rounds to 50; 59 rounds to 60
- 50 + 60 = 110
The exact answer is 111, close to the estimate.
3.Estimate 76 + 38 by rounding each number to the nearest 10.
Answer: 120
- 76 rounds to 80; 38 rounds to 40
- 80 + 40 = 120
The exact answer is 114, close to the estimate.
4.Estimate 42 − 21 by rounding each number to the nearest 10.
Answer: 20
- 42 rounds to 40; 21 rounds to 20
- 40 − 20 = 20
The exact answer is 21, close to the estimate.
5.Estimate 72 − 13 by rounding each number to the nearest 10.
Answer: 60
- 72 rounds to 70; 13 rounds to 10
- 70 − 10 = 60
The exact answer is 59, close to the estimate.
6.Estimate 89 − 57 by rounding each number to the nearest 10.
Answer: 30
- 89 rounds to 90; 57 rounds to 60
- 90 − 60 = 30
The exact answer is 32, close to the estimate.
7.Estimate 57 + 96 by rounding each number to the nearest 10.
Answer: 160
- 57 rounds to 60; 96 rounds to 100
- 60 + 100 = 160
The exact answer is 153, close to the estimate.
8.Estimate 45 − 23 by rounding each number to the nearest 10.
Answer: 30
- 45 rounds to 50; 23 rounds to 20
- 50 − 20 = 30
The exact answer is 22, close to the estimate.
9.Estimate 82 − 31 by rounding each number to the nearest 10.
Answer: 50
- 82 rounds to 80; 31 rounds to 30
- 80 − 30 = 50
The exact answer is 51, close to the estimate.
10.Estimate 89 − 71 by rounding each number to the nearest 10.
Answer: 20
- 89 rounds to 90; 71 rounds to 70
- 90 − 70 = 20
The exact answer is 18, close to the estimate.
Marking tips
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