Year 4 Estimating Sums, Differences and Products Worksheet — Level 1 — Practice Set 4 — 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 — Practice Set 4 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 51 + 82 by rounding each number to the nearest 10.
Answer: 130
- 51 rounds to 50; 82 rounds to 80
- 50 + 80 = 130
The exact answer is 133, close to the estimate.
2.Estimate 73 − 39 by rounding each number to the nearest 10.
Answer: 30
- 73 rounds to 70; 39 rounds to 40
- 70 − 40 = 30
The exact answer is 34, close to the estimate.
3.Estimate 98 + 97 by rounding each number to the nearest 10.
Answer: 200
- 98 rounds to 100; 97 rounds to 100
- 100 + 100 = 200
The exact answer is 195, close to the estimate.
4.Estimate 97 − 47 by rounding each number to the nearest 10.
Answer: 50
- 97 rounds to 100; 47 rounds to 50
- 100 − 50 = 50
The exact answer is 50, close to the estimate.
5.Estimate 16 + 68 by rounding each number to the nearest 10.
Answer: 90
- 16 rounds to 20; 68 rounds to 70
- 20 + 70 = 90
The exact answer is 84, close to the estimate.
6.Estimate 56 − 11 by rounding each number to the nearest 10.
Answer: 50
- 56 rounds to 60; 11 rounds to 10
- 60 − 10 = 50
The exact answer is 45, close to the estimate.
7.Estimate 44 + 47 by rounding each number to the nearest 10.
Answer: 90
- 44 rounds to 40; 47 rounds to 50
- 40 + 50 = 90
The exact answer is 91, close to the estimate.
8.Estimate 79 − 35 by rounding each number to the nearest 10.
Answer: 40
- 79 rounds to 80; 35 rounds to 40
- 80 − 40 = 40
The exact answer is 44, close to the estimate.
9.Estimate 58 − 15 by rounding each number to the nearest 10.
Answer: 40
- 58 rounds to 60; 15 rounds to 20
- 60 − 20 = 40
The exact answer is 43, close to the estimate.
10.Estimate 65 + 99 by rounding each number to the nearest 10.
Answer: 170
- 65 rounds to 70; 99 rounds to 100
- 70 + 100 = 170
The exact answer is 164, close to the estimate.
Marking tips
- Give credit for correct method even when the final answer slips — the working shows where the thinking went right.
- For open-ended tasks, use the success criteria as a checklist rather than looking for one "right" answer.
- Celebrate what went well first, then pick one thing to work on next.