Year 3 Estimating Sums, Differences and Products Worksheet — Level 3 — Practice Set 4 — 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 4 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 7,323 − 1,206 by rounding each number to the nearest 100.
Answer: 6,100
- 7,323 rounds to 7,300; 1,206 rounds to 1,200
- 7,300 − 1,200 = 6,100
The exact answer is 6,117, close to the estimate.
2.Estimate 13 × 44 by rounding each number to the nearest 10.
Answer: 400
- 13 rounds to 10; 44 rounds to 40
- 10 × 40 = 400
The exact answer is 572.
3.Estimate 41 × 4 by rounding 41 to the nearest 10.
Answer: 160
- 41 rounds to 40
- 40 × 4 = 160
The exact answer is 164.
4.Estimate 5,203 + 6,953 by rounding each number to the nearest 1,000.
Answer: 12,000
- 5,203 rounds to 5,000; 6,953 rounds to 7,000
- 5,000 + 7,000 = 12,000
The exact answer is 12,156, close to the estimate.
5.Estimate 29 × 36 by rounding each number to the nearest 10.
Answer: 1,200
- 29 rounds to 30; 36 rounds to 40
- 30 × 40 = 1,200
The exact answer is 1,044.
6.Estimate 79 × 46 by rounding each number to the nearest 10.
Answer: 4,000
- 79 rounds to 80; 46 rounds to 50
- 80 × 50 = 4,000
The exact answer is 3,634.
7.Estimate 1,901 + 6,225 by rounding each number to the nearest 1,000.
Answer: 8,000
- 1,901 rounds to 2,000; 6,225 rounds to 6,000
- 2,000 + 6,000 = 8,000
The exact answer is 8,126, close to the estimate.
8.Estimate 31 × 82 by rounding each number to the nearest 10.
Answer: 2,400
- 31 rounds to 30; 82 rounds to 80
- 30 × 80 = 2,400
The exact answer is 2,542.
9.Estimate 87 × 25 by rounding each number to the nearest 10.
Answer: 2,700
- 87 rounds to 90; 25 rounds to 30
- 90 × 30 = 2,700
The exact answer is 2,175.
10.Estimate 9,778 − 6,777 by rounding each number to the nearest 1,000.
Answer: 3,000
- 9,778 rounds to 10,000; 6,777 rounds to 7,000
- 10,000 − 7,000 = 3,000
The exact answer is 3,001, 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.