Year 7 Estimating Sums, Differences and Products Worksheet — Level 1 — Answers
Answer sheet with worked solutions for the Year 7 place value worksheet.
Success TutoringWorksheetsAnswer sheetYear 7 · Mathematics · Place ValueYear 7 Estimating Sums, Differences and Products Worksheet — Level 1 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 12 + 53 by rounding each number to the nearest 10.
Answer: 60
- 12 rounds to 10; 53 rounds to 50
- 10 + 50 = 60
The exact answer is 65, close to the estimate.
2.Estimate 18 + 34 by rounding each number to the nearest 10.
Answer: 50
- 18 rounds to 20; 34 rounds to 30
- 20 + 30 = 50
The exact answer is 52, close to the estimate.
3.Estimate 97 − 69 by rounding each number to the nearest 10.
Answer: 30
- 97 rounds to 100; 69 rounds to 70
- 100 − 70 = 30
The exact answer is 28, close to the estimate.
4.Estimate 69 − 27 by rounding each number to the nearest 10.
Answer: 40
- 69 rounds to 70; 27 rounds to 30
- 70 − 30 = 40
The exact answer is 42, close to the estimate.
5.Estimate 86 − 64 by rounding each number to the nearest 10.
Answer: 30
- 86 rounds to 90; 64 rounds to 60
- 90 − 60 = 30
The exact answer is 22, close to the estimate.
6.Estimate 33 + 24 by rounding each number to the nearest 10.
Answer: 50
- 33 rounds to 30; 24 rounds to 20
- 30 + 20 = 50
The exact answer is 57, close to the estimate.
7.Estimate 67 + 54 by rounding each number to the nearest 10.
Answer: 120
- 67 rounds to 70; 54 rounds to 50
- 70 + 50 = 120
The exact answer is 121, close to the estimate.
8.Estimate 24 + 69 by rounding each number to the nearest 10.
Answer: 90
- 24 rounds to 20; 69 rounds to 70
- 20 + 70 = 90
The exact answer is 93, close to the estimate.
9.Estimate 43 + 55 by rounding each number to the nearest 10.
Answer: 100
- 43 rounds to 40; 55 rounds to 60
- 40 + 60 = 100
The exact answer is 98, close to the estimate.
10.Estimate 33 + 91 by rounding each number to the nearest 10.
Answer: 120
- 33 rounds to 30; 91 rounds to 90
- 30 + 90 = 120
The exact answer is 124, close to the estimate.
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