Year 4 Estimating Sums, Differences and Products Worksheet — Level 3 — 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 3 — Practice Set 3 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 2,895 − 1,202 by rounding each number to the nearest 100.
Answer: 1,700
- 2,895 rounds to 2,900; 1,202 rounds to 1,200
- 2,900 − 1,200 = 1,700
The exact answer is 1,693, close to the estimate.
2.Estimate 84 × 43 by rounding each number to the nearest 10.
Answer: 3,200
- 84 rounds to 80; 43 rounds to 40
- 80 × 40 = 3,200
The exact answer is 3,612.
3.Estimate 93 × 18 by rounding each number to the nearest 10.
Answer: 1,800
- 93 rounds to 90; 18 rounds to 20
- 90 × 20 = 1,800
The exact answer is 1,674.
4.Estimate 8,109 − 4,540 by rounding each number to the nearest 1,000.
Answer: 3,000
- 8,109 rounds to 8,000; 4,540 rounds to 5,000
- 8,000 − 5,000 = 3,000
The exact answer is 3,569, close to the estimate.
5.Estimate 62 × 88 by rounding each number to the nearest 10.
Answer: 5,400
- 62 rounds to 60; 88 rounds to 90
- 60 × 90 = 5,400
The exact answer is 5,456.
6.Estimate 53 × 73 by rounding each number to the nearest 10.
Answer: 3,500
- 53 rounds to 50; 73 rounds to 70
- 50 × 70 = 3,500
The exact answer is 3,869.
7.Estimate 4,155 + 1,802 by rounding each number to the nearest 100.
Answer: 6,000
- 4,155 rounds to 4,200; 1,802 rounds to 1,800
- 4,200 + 1,800 = 6,000
The exact answer is 5,957, close to the estimate.
8.Estimate 66 × 38 by rounding each number to the nearest 10.
Answer: 2,800
- 66 rounds to 70; 38 rounds to 40
- 70 × 40 = 2,800
The exact answer is 2,508.
9.Estimate 29 × 21 by rounding each number to the nearest 10.
Answer: 600
- 29 rounds to 30; 21 rounds to 20
- 30 × 20 = 600
The exact answer is 609.
10.Estimate 9,880 − 8,797 by rounding each number to the nearest 100.
Answer: 1,100
- 9,880 rounds to 9,900; 8,797 rounds to 8,800
- 9,900 − 8,800 = 1,100
The exact answer is 1,083, 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.