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 93 − 51 by rounding each number to the nearest 10.
Answer: 40
- 93 rounds to 90; 51 rounds to 50
- 90 − 50 = 40
The exact answer is 42, close to the estimate.
2.Estimate 24 + 41 by rounding each number to the nearest 10.
Answer: 60
- 24 rounds to 20; 41 rounds to 40
- 20 + 40 = 60
The exact answer is 65, close to the estimate.
3.Estimate 13 + 69 by rounding each number to the nearest 10.
Answer: 80
- 13 rounds to 10; 69 rounds to 70
- 10 + 70 = 80
The exact answer is 82, close to the estimate.
4.Estimate 87 + 95 by rounding each number to the nearest 10.
Answer: 190
- 87 rounds to 90; 95 rounds to 100
- 90 + 100 = 190
The exact answer is 182, close to the estimate.
5.Estimate 46 + 53 by rounding each number to the nearest 10.
Answer: 100
- 46 rounds to 50; 53 rounds to 50
- 50 + 50 = 100
The exact answer is 99, close to the estimate.
6.Estimate 29 + 12 by rounding each number to the nearest 10.
Answer: 40
- 29 rounds to 30; 12 rounds to 10
- 30 + 10 = 40
The exact answer is 41, close to the estimate.
7.Estimate 99 − 56 by rounding each number to the nearest 10.
Answer: 40
- 99 rounds to 100; 56 rounds to 60
- 100 − 60 = 40
The exact answer is 43, close to the estimate.
8.Estimate 87 + 81 by rounding each number to the nearest 10.
Answer: 170
- 87 rounds to 90; 81 rounds to 80
- 90 + 80 = 170
The exact answer is 168, close to the estimate.
9.Estimate 17 + 73 by rounding each number to the nearest 10.
Answer: 90
- 17 rounds to 20; 73 rounds to 70
- 20 + 70 = 90
The exact answer is 90, close to the estimate.
10.Estimate 74 − 56 by rounding each number to the nearest 10.
Answer: 10
- 74 rounds to 70; 56 rounds to 60
- 70 − 60 = 10
The exact answer is 18, close to the estimate.
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