Year 3 Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 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 — Practice Set 2 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 416 − 335 by rounding each number to the nearest 100.
Answer: 100
- 416 rounds to 400; 335 rounds to 300
- 400 − 300 = 100
The exact answer is 81, close to the estimate.
2.Estimate 71 × 3 by rounding 71 to the nearest 10.
Answer: 210
- 71 rounds to 70
- 70 × 3 = 210
The exact answer is 213.
3.Estimate 906 + 667 by rounding each number to the nearest 100.
Answer: 1,600
- 906 rounds to 900; 667 rounds to 700
- 900 + 700 = 1,600
The exact answer is 1,573, close to the estimate.
4.Estimate 58 × 9 by rounding 58 to the nearest 10.
Answer: 540
- 58 rounds to 60
- 60 × 9 = 540
The exact answer is 522.
5.Estimate 910 − 152 by rounding each number to the nearest 100.
Answer: 700
- 910 rounds to 900; 152 rounds to 200
- 900 − 200 = 700
The exact answer is 758, close to the estimate.
6.Estimate 65 × 8 by rounding 65 to the nearest 10.
Answer: 560
- 65 rounds to 70
- 70 × 8 = 560
The exact answer is 520.
7.Estimate 680 − 490 by rounding each number to the nearest 100.
Answer: 200
- 680 rounds to 700; 490 rounds to 500
- 700 − 500 = 200
The exact answer is 190, close to the estimate.
8.Estimate 71 × 5 by rounding 71 to the nearest 10.
Answer: 350
- 71 rounds to 70
- 70 × 5 = 350
The exact answer is 355.
9.Estimate 174 + 362 by rounding each number to the nearest 100.
Answer: 600
- 174 rounds to 200; 362 rounds to 400
- 200 + 400 = 600
The exact answer is 536, close to the estimate.
10.Estimate 97 × 7 by rounding 97 to the nearest 10.
Answer: 700
- 97 rounds to 100
- 100 × 7 = 700
The exact answer is 679.
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.