Year 7 Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 4 — Answers
Answer sheet with worked solutions for the Year 7 place value worksheet.
Success TutoringWorksheetsAnswer sheetYear 7 · Mathematics · Place ValueYear 7 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 150 + 806 by rounding each number to the nearest 100.
Answer: 1,000
- 150 rounds to 200; 806 rounds to 800
- 200 + 800 = 1,000
The exact answer is 956, close to the estimate.
2.Estimate 32 × 6 by rounding 32 to the nearest 10.
Answer: 180
- 32 rounds to 30
- 30 × 6 = 180
The exact answer is 192.
3.Estimate 352 + 805 by rounding each number to the nearest 100.
Answer: 1,200
- 352 rounds to 400; 805 rounds to 800
- 400 + 800 = 1,200
The exact answer is 1,157, close to the estimate.
4.Estimate 52 × 5 by rounding 52 to the nearest 10.
Answer: 250
- 52 rounds to 50
- 50 × 5 = 250
The exact answer is 260.
5.Estimate 846 − 185 by rounding each number to the nearest 100.
Answer: 600
- 846 rounds to 800; 185 rounds to 200
- 800 − 200 = 600
The exact answer is 661, close to the estimate.
6.Estimate 55 × 4 by rounding 55 to the nearest 10.
Answer: 240
- 55 rounds to 60
- 60 × 4 = 240
The exact answer is 220.
7.Estimate 431 − 127 by rounding each number to the nearest 100.
Answer: 300
- 431 rounds to 400; 127 rounds to 100
- 400 − 100 = 300
The exact answer is 304, close to the estimate.
8.Estimate 21 × 7 by rounding 21 to the nearest 10.
Answer: 140
- 21 rounds to 20
- 20 × 7 = 140
The exact answer is 147.
9.Estimate 782 − 250 by rounding each number to the nearest 100.
Answer: 500
- 782 rounds to 800; 250 rounds to 300
- 800 − 300 = 500
The exact answer is 532, close to the estimate.
10.Estimate 26 × 4 by rounding 26 to the nearest 10.
Answer: 120
- 26 rounds to 30
- 30 × 4 = 120
The exact answer is 104.
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.