Year 4 Estimating Sums, Differences and Products Worksheet — Level 2 — 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 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 301 + 246 by rounding each number to the nearest 100.
Answer: 500
- 301 rounds to 300; 246 rounds to 200
- 300 + 200 = 500
The exact answer is 547, close to the estimate.
2.Estimate 68 × 9 by rounding 68 to the nearest 10.
Answer: 630
- 68 rounds to 70
- 70 × 9 = 630
The exact answer is 612.
3.Estimate 195 + 810 by rounding each number to the nearest 100.
Answer: 1,000
- 195 rounds to 200; 810 rounds to 800
- 200 + 800 = 1,000
The exact answer is 1,005, close to the estimate.
4.Estimate 46 × 3 by rounding 46 to the nearest 10.
Answer: 150
- 46 rounds to 50
- 50 × 3 = 150
The exact answer is 138.
5.Estimate 507 + 592 by rounding each number to the nearest 100.
Answer: 1,100
- 507 rounds to 500; 592 rounds to 600
- 500 + 600 = 1,100
The exact answer is 1,099, close to the estimate.
6.Estimate 62 × 7 by rounding 62 to the nearest 10.
Answer: 420
- 62 rounds to 60
- 60 × 7 = 420
The exact answer is 434.
7.Estimate 570 + 233 by rounding each number to the nearest 100.
Answer: 800
- 570 rounds to 600; 233 rounds to 200
- 600 + 200 = 800
The exact answer is 803, close to the estimate.
8.Estimate 95 × 9 by rounding 95 to the nearest 10.
Answer: 900
- 95 rounds to 100
- 100 × 9 = 900
The exact answer is 855.
9.Estimate 677 − 179 by rounding each number to the nearest 100.
Answer: 500
- 677 rounds to 700; 179 rounds to 200
- 700 − 200 = 500
The exact answer is 498, close to the estimate.
10.Estimate 86 × 5 by rounding 86 to the nearest 10.
Answer: 450
- 86 rounds to 90
- 90 × 5 = 450
The exact answer is 430.
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.