Year 5 Estimating Sums, Differences and Products Worksheet — Level 1 — Answers
Answer sheet with worked solutions for the Year 5 place value worksheet.
Success TutoringWorksheetsAnswer sheetYear 5 · Mathematics · Place ValueYear 5 Estimating Sums, Differences and Products Worksheet — Level 1 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 94 − 83 by rounding each number to the nearest 10.
Answer: 10
- 94 rounds to 90; 83 rounds to 80
- 90 − 80 = 10
The exact answer is 11, close to the estimate.
2.Estimate 89 + 87 by rounding each number to the nearest 10.
Answer: 180
- 89 rounds to 90; 87 rounds to 90
- 90 + 90 = 180
The exact answer is 176, close to the estimate.
3.Estimate 64 + 92 by rounding each number to the nearest 10.
Answer: 150
- 64 rounds to 60; 92 rounds to 90
- 60 + 90 = 150
The exact answer is 156, close to the estimate.
4.Estimate 57 + 71 by rounding each number to the nearest 10.
Answer: 130
- 57 rounds to 60; 71 rounds to 70
- 60 + 70 = 130
The exact answer is 128, close to the estimate.
5.Estimate 72 − 55 by rounding each number to the nearest 10.
Answer: 10
- 72 rounds to 70; 55 rounds to 60
- 70 − 60 = 10
The exact answer is 17, close to the estimate.
6.Estimate 82 − 19 by rounding each number to the nearest 10.
Answer: 60
- 82 rounds to 80; 19 rounds to 20
- 80 − 20 = 60
The exact answer is 63, close to the estimate.
7.Estimate 39 + 97 by rounding each number to the nearest 10.
Answer: 140
- 39 rounds to 40; 97 rounds to 100
- 40 + 100 = 140
The exact answer is 136, close to the estimate.
8.Estimate 36 − 33 by rounding each number to the nearest 10.
Answer: 10
- 36 rounds to 40; 33 rounds to 30
- 40 − 30 = 10
The exact answer is 3, close to the estimate.
9.Estimate 39 + 42 by rounding each number to the nearest 10.
Answer: 80
- 39 rounds to 40; 42 rounds to 40
- 40 + 40 = 80
The exact answer is 81, close to the estimate.
10.Estimate 91 + 93 by rounding each number to the nearest 10.
Answer: 180
- 91 rounds to 90; 93 rounds to 90
- 90 + 90 = 180
The exact answer is 184, close to the estimate.
Marking tips
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