Year 4 Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 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 — Practice Set 2 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 834 − 363 by rounding each number to the nearest 100.
Answer: 400
- 834 rounds to 800; 363 rounds to 400
- 800 − 400 = 400
The exact answer is 471, close to the estimate.
2.Estimate 96 × 7 by rounding 96 to the nearest 10.
Answer: 700
- 96 rounds to 100
- 100 × 7 = 700
The exact answer is 672.
3.Estimate 846 − 159 by rounding each number to the nearest 100.
Answer: 600
- 846 rounds to 800; 159 rounds to 200
- 800 − 200 = 600
The exact answer is 687, close to the estimate.
4.Estimate 68 × 8 by rounding 68 to the nearest 10.
Answer: 560
- 68 rounds to 70
- 70 × 8 = 560
The exact answer is 544.
5.Estimate 443 + 328 by rounding each number to the nearest 100.
Answer: 700
- 443 rounds to 400; 328 rounds to 300
- 400 + 300 = 700
The exact answer is 771, close to the estimate.
6.Estimate 52 × 5 by rounding 52 to the nearest 10.
Answer: 250
- 52 rounds to 50
- 50 × 5 = 250
The exact answer is 260.
7.Estimate 486 + 305 by rounding each number to the nearest 100.
Answer: 800
- 486 rounds to 500; 305 rounds to 300
- 500 + 300 = 800
The exact answer is 791, close to the estimate.
8.Estimate 66 × 9 by rounding 66 to the nearest 10.
Answer: 630
- 66 rounds to 70
- 70 × 9 = 630
The exact answer is 594.
9.Estimate 957 − 406 by rounding each number to the nearest 100.
Answer: 600
- 957 rounds to 1,000; 406 rounds to 400
- 1,000 − 400 = 600
The exact answer is 551, close to the estimate.
10.Estimate 75 × 7 by rounding 75 to the nearest 10.
Answer: 560
- 75 rounds to 80
- 80 × 7 = 560
The exact answer is 525.
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.