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 64 + 66 by rounding each number to the nearest 10.
Answer: 130
- 64 rounds to 60; 66 rounds to 70
- 60 + 70 = 130
The exact answer is 130, close to the estimate.
2.Estimate 92 − 42 by rounding each number to the nearest 10.
Answer: 50
- 92 rounds to 90; 42 rounds to 40
- 90 − 40 = 50
The exact answer is 50, close to the estimate.
3.Estimate 49 + 26 by rounding each number to the nearest 10.
Answer: 80
- 49 rounds to 50; 26 rounds to 30
- 50 + 30 = 80
The exact answer is 75, close to the estimate.
4.Estimate 67 − 33 by rounding each number to the nearest 10.
Answer: 40
- 67 rounds to 70; 33 rounds to 30
- 70 − 30 = 40
The exact answer is 34, close to the estimate.
5.Estimate 48 + 29 by rounding each number to the nearest 10.
Answer: 80
- 48 rounds to 50; 29 rounds to 30
- 50 + 30 = 80
The exact answer is 77, close to the estimate.
6.Estimate 47 − 23 by rounding each number to the nearest 10.
Answer: 30
- 47 rounds to 50; 23 rounds to 20
- 50 − 20 = 30
The exact answer is 24, close to the estimate.
7.Estimate 42 + 58 by rounding each number to the nearest 10.
Answer: 100
- 42 rounds to 40; 58 rounds to 60
- 40 + 60 = 100
The exact answer is 100, close to the estimate.
8.Estimate 26 + 23 by rounding each number to the nearest 10.
Answer: 50
- 26 rounds to 30; 23 rounds to 20
- 30 + 20 = 50
The exact answer is 49, close to the estimate.
9.Estimate 97 − 46 by rounding each number to the nearest 10.
Answer: 50
- 97 rounds to 100; 46 rounds to 50
- 100 − 50 = 50
The exact answer is 51, close to the estimate.
10.Estimate 85 − 15 by rounding each number to the nearest 10.
Answer: 70
- 85 rounds to 90; 15 rounds to 20
- 90 − 20 = 70
The exact answer is 70, close to the estimate.
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