Year 3 Estimating Sums, Differences and Products Worksheet — Level 2 — 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 2 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 563 + 560 by rounding each number to the nearest 100.
Answer: 1,200
- 563 rounds to 600; 560 rounds to 600
- 600 + 600 = 1,200
The exact answer is 1,123, close to the estimate.
2.Estimate 63 × 8 by rounding 63 to the nearest 10.
Answer: 480
- 63 rounds to 60
- 60 × 8 = 480
The exact answer is 504.
3.Estimate 820 + 417 by rounding each number to the nearest 100.
Answer: 1,200
- 820 rounds to 800; 417 rounds to 400
- 800 + 400 = 1,200
The exact answer is 1,237, close to the estimate.
4.Estimate 83 × 5 by rounding 83 to the nearest 10.
Answer: 400
- 83 rounds to 80
- 80 × 5 = 400
The exact answer is 415.
5.Estimate 955 − 826 by rounding each number to the nearest 100.
Answer: 200
- 955 rounds to 1,000; 826 rounds to 800
- 1,000 − 800 = 200
The exact answer is 129, close to the estimate.
6.Estimate 62 × 8 by rounding 62 to the nearest 10.
Answer: 480
- 62 rounds to 60
- 60 × 8 = 480
The exact answer is 496.
7.Estimate 627 − 249 by rounding each number to the nearest 100.
Answer: 400
- 627 rounds to 600; 249 rounds to 200
- 600 − 200 = 400
The exact answer is 378, close to the estimate.
8.Estimate 23 × 3 by rounding 23 to the nearest 10.
Answer: 60
- 23 rounds to 20
- 20 × 3 = 60
The exact answer is 69.
9.Estimate 963 − 604 by rounding each number to the nearest 100.
Answer: 400
- 963 rounds to 1,000; 604 rounds to 600
- 1,000 − 600 = 400
The exact answer is 359, close to the estimate.
10.Estimate 79 × 7 by rounding 79 to the nearest 10.
Answer: 560
- 79 rounds to 80
- 80 × 7 = 560
The exact answer is 553.
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.