Year 4 Estimating Sums, Differences and Products Worksheet — Level 1 — Practice Set 3 — 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 3 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 69 + 12 by rounding each number to the nearest 10.
Answer: 80
- 69 rounds to 70; 12 rounds to 10
- 70 + 10 = 80
The exact answer is 81, close to the estimate.
2.Estimate 52 − 43 by rounding each number to the nearest 10.
Answer: 10
- 52 rounds to 50; 43 rounds to 40
- 50 − 40 = 10
The exact answer is 9, close to the estimate.
3.Estimate 74 + 17 by rounding each number to the nearest 10.
Answer: 90
- 74 rounds to 70; 17 rounds to 20
- 70 + 20 = 90
The exact answer is 91, close to the estimate.
4.Estimate 81 + 98 by rounding each number to the nearest 10.
Answer: 180
- 81 rounds to 80; 98 rounds to 100
- 80 + 100 = 180
The exact answer is 179, close to the estimate.
5.Estimate 77 − 22 by rounding each number to the nearest 10.
Answer: 60
- 77 rounds to 80; 22 rounds to 20
- 80 − 20 = 60
The exact answer is 55, close to the estimate.
6.Estimate 24 + 81 by rounding each number to the nearest 10.
Answer: 100
- 24 rounds to 20; 81 rounds to 80
- 20 + 80 = 100
The exact answer is 105, close to the estimate.
7.Estimate 32 + 99 by rounding each number to the nearest 10.
Answer: 130
- 32 rounds to 30; 99 rounds to 100
- 30 + 100 = 130
The exact answer is 131, close to the estimate.
8.Estimate 39 + 96 by rounding each number to the nearest 10.
Answer: 140
- 39 rounds to 40; 96 rounds to 100
- 40 + 100 = 140
The exact answer is 135, close to the estimate.
9.Estimate 67 + 17 by rounding each number to the nearest 10.
Answer: 90
- 67 rounds to 70; 17 rounds to 20
- 70 + 20 = 90
The exact answer is 84, close to the estimate.
10.Estimate 86 + 59 by rounding each number to the nearest 10.
Answer: 150
- 86 rounds to 90; 59 rounds to 60
- 90 + 60 = 150
The exact answer is 145, 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.