Year 4 Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 4 — 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 2 — Practice Set 4 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 992 + 861 by rounding each number to the nearest 100.
Answer: 1,900
- 992 rounds to 1,000; 861 rounds to 900
- 1,000 + 900 = 1,900
The exact answer is 1,853, close to the estimate.
2.Estimate 72 × 3 by rounding 72 to the nearest 10.
Answer: 210
- 72 rounds to 70
- 70 × 3 = 210
The exact answer is 216.
3.Estimate 797 − 217 by rounding each number to the nearest 100.
Answer: 600
- 797 rounds to 800; 217 rounds to 200
- 800 − 200 = 600
The exact answer is 580, close to the estimate.
4.Estimate 55 × 7 by rounding 55 to the nearest 10.
Answer: 420
- 55 rounds to 60
- 60 × 7 = 420
The exact answer is 385.
5.Estimate 240 + 631 by rounding each number to the nearest 100.
Answer: 800
- 240 rounds to 200; 631 rounds to 600
- 200 + 600 = 800
The exact answer is 871, close to the estimate.
6.Estimate 33 × 8 by rounding 33 to the nearest 10.
Answer: 240
- 33 rounds to 30
- 30 × 8 = 240
The exact answer is 264.
7.Estimate 127 + 545 by rounding each number to the nearest 100.
Answer: 600
- 127 rounds to 100; 545 rounds to 500
- 100 + 500 = 600
The exact answer is 672, close to the estimate.
8.Estimate 66 × 6 by rounding 66 to the nearest 10.
Answer: 420
- 66 rounds to 70
- 70 × 6 = 420
The exact answer is 396.
9.Estimate 512 + 663 by rounding each number to the nearest 100.
Answer: 1,200
- 512 rounds to 500; 663 rounds to 700
- 500 + 700 = 1,200
The exact answer is 1,175, close to the estimate.
10.Estimate 32 × 6 by rounding 32 to the nearest 10.
Answer: 180
- 32 rounds to 30
- 30 × 6 = 180
The exact answer is 192.
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.