Year 4 Estimating Sums, Differences and Products Worksheet — Level 1 — Answers
Answer sheet with worked solutions for the Year 4 place value worksheet.
Success TutoringWorksheetsAnswer sheetYear 4 · Mathematics · Place ValueYear 4 Estimating Sums, Differences and Products Worksheet — Level 1 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 56 + 61 by rounding each number to the nearest 10.
Answer: 120
- 56 rounds to 60; 61 rounds to 60
- 60 + 60 = 120
The exact answer is 117, close to the estimate.
2.Estimate 56 − 29 by rounding each number to the nearest 10.
Answer: 30
- 56 rounds to 60; 29 rounds to 30
- 60 − 30 = 30
The exact answer is 27, close to the estimate.
3.Estimate 79 + 57 by rounding each number to the nearest 10.
Answer: 140
- 79 rounds to 80; 57 rounds to 60
- 80 + 60 = 140
The exact answer is 136, close to the estimate.
4.Estimate 23 + 89 by rounding each number to the nearest 10.
Answer: 110
- 23 rounds to 20; 89 rounds to 90
- 20 + 90 = 110
The exact answer is 112, close to the estimate.
5.Estimate 99 − 88 by rounding each number to the nearest 10.
Answer: 10
- 99 rounds to 100; 88 rounds to 90
- 100 − 90 = 10
The exact answer is 11, close to the estimate.
6.Estimate 37 + 14 by rounding each number to the nearest 10.
Answer: 50
- 37 rounds to 40; 14 rounds to 10
- 40 + 10 = 50
The exact answer is 51, close to the estimate.
7.Estimate 54 + 18 by rounding each number to the nearest 10.
Answer: 70
- 54 rounds to 50; 18 rounds to 20
- 50 + 20 = 70
The exact answer is 72, close to the estimate.
8.Estimate 82 − 56 by rounding each number to the nearest 10.
Answer: 20
- 82 rounds to 80; 56 rounds to 60
- 80 − 60 = 20
The exact answer is 26, close to the estimate.
9.Estimate 66 − 62 by rounding each number to the nearest 10.
Answer: 10
- 66 rounds to 70; 62 rounds to 60
- 70 − 60 = 10
The exact answer is 4, close to the estimate.
10.Estimate 65 − 61 by rounding each number to the nearest 10.
Answer: 10
- 65 rounds to 70; 61 rounds to 60
- 70 − 60 = 10
The exact answer is 4, close to the estimate.
Marking tips
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