Year 4 Estimating Sums, Differences and Products Worksheet — Level 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 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 9,762 − 7,627 by rounding each number to the nearest 1,000.
Answer: 2,000
- 9,762 rounds to 10,000; 7,627 rounds to 8,000
- 10,000 − 8,000 = 2,000
The exact answer is 2,135, close to the estimate.
2.Estimate 63 × 85 by rounding each number to the nearest 10.
Answer: 5,400
- 63 rounds to 60; 85 rounds to 90
- 60 × 90 = 5,400
The exact answer is 5,355.
3.Estimate 77 × 3 by rounding 77 to the nearest 10.
Answer: 240
- 77 rounds to 80
- 80 × 3 = 240
The exact answer is 231.
4.Estimate 9,613 − 5,448 by rounding each number to the nearest 1,000.
Answer: 5,000
- 9,613 rounds to 10,000; 5,448 rounds to 5,000
- 10,000 − 5,000 = 5,000
The exact answer is 4,165, close to the estimate.
5.Estimate 24 × 45 by rounding each number to the nearest 10.
Answer: 1,000
- 24 rounds to 20; 45 rounds to 50
- 20 × 50 = 1,000
The exact answer is 1,080.
6.Estimate 73 × 7 by rounding 73 to the nearest 10.
Answer: 490
- 73 rounds to 70
- 70 × 7 = 490
The exact answer is 511.
7.Estimate 7,584 + 1,501 by rounding each number to the nearest 100.
Answer: 9,100
- 7,584 rounds to 7,600; 1,501 rounds to 1,500
- 7,600 + 1,500 = 9,100
The exact answer is 9,085, close to the estimate.
8.Estimate 87 × 11 by rounding each number to the nearest 10.
Answer: 900
- 87 rounds to 90; 11 rounds to 10
- 90 × 10 = 900
The exact answer is 957.
9.Estimate 51 × 9 by rounding 51 to the nearest 10.
Answer: 450
- 51 rounds to 50
- 50 × 9 = 450
The exact answer is 459.
10.Estimate 9,665 − 6,926 by rounding each number to the nearest 1,000.
Answer: 3,000
- 9,665 rounds to 10,000; 6,926 rounds to 7,000
- 10,000 − 7,000 = 3,000
The exact answer is 2,739, 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.