Year 3 Estimating Sums, Differences and Products Worksheet — Level 3 — Practice Set 3 — Answers
Answer sheet with worked solutions for the Year 3 place value worksheet.
Success TutoringWorksheetsAnswer sheetYear 3 · Mathematics · Place ValueYear 3 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 3,070 − 1,721 by rounding each number to the nearest 1,000.
Answer: 1,000
- 3,070 rounds to 3,000; 1,721 rounds to 2,000
- 3,000 − 2,000 = 1,000
The exact answer is 1,349, close to the estimate.
2.Estimate 44 × 62 by rounding each number to the nearest 10.
Answer: 2,400
- 44 rounds to 40; 62 rounds to 60
- 40 × 60 = 2,400
The exact answer is 2,728.
3.Estimate 27 × 46 by rounding each number to the nearest 10.
Answer: 1,500
- 27 rounds to 30; 46 rounds to 50
- 30 × 50 = 1,500
The exact answer is 1,242.
4.Estimate 5,368 − 2,944 by rounding each number to the nearest 100.
Answer: 2,500
- 5,368 rounds to 5,400; 2,944 rounds to 2,900
- 5,400 − 2,900 = 2,500
The exact answer is 2,424, close to the estimate.
5.Estimate 49 × 61 by rounding each number to the nearest 10.
Answer: 3,000
- 49 rounds to 50; 61 rounds to 60
- 50 × 60 = 3,000
The exact answer is 2,989.
6.Estimate 51 × 93 by rounding each number to the nearest 10.
Answer: 4,500
- 51 rounds to 50; 93 rounds to 90
- 50 × 90 = 4,500
The exact answer is 4,743.
7.Estimate 7,290 − 6,746 by rounding each number to the nearest 100.
Answer: 600
- 7,290 rounds to 7,300; 6,746 rounds to 6,700
- 7,300 − 6,700 = 600
The exact answer is 544, close to the estimate.
8.Estimate 82 × 14 by rounding each number to the nearest 10.
Answer: 800
- 82 rounds to 80; 14 rounds to 10
- 80 × 10 = 800
The exact answer is 1,148.
9.Estimate 75 × 3 by rounding 75 to the nearest 10.
Answer: 240
- 75 rounds to 80
- 80 × 3 = 240
The exact answer is 225.
10.Estimate 4,281 + 9,491 by rounding each number to the nearest 100.
Answer: 13,800
- 4,281 rounds to 4,300; 9,491 rounds to 9,500
- 4,300 + 9,500 = 13,800
The exact answer is 13,772, 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.