Year 7 Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 2 — 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 2 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 680 + 833 by rounding each number to the nearest 100.
Answer: 1,500
- 680 rounds to 700; 833 rounds to 800
- 700 + 800 = 1,500
The exact answer is 1,513, close to the estimate.
2.Estimate 54 × 4 by rounding 54 to the nearest 10.
Answer: 200
- 54 rounds to 50
- 50 × 4 = 200
The exact answer is 216.
3.Estimate 627 + 444 by rounding each number to the nearest 100.
Answer: 1,000
- 627 rounds to 600; 444 rounds to 400
- 600 + 400 = 1,000
The exact answer is 1,071, close to the estimate.
4.Estimate 19 × 4 by rounding 19 to the nearest 10.
Answer: 80
- 19 rounds to 20
- 20 × 4 = 80
The exact answer is 76.
5.Estimate 462 + 649 by rounding each number to the nearest 100.
Answer: 1,100
- 462 rounds to 500; 649 rounds to 600
- 500 + 600 = 1,100
The exact answer is 1,111, close to the estimate.
6.Estimate 47 × 9 by rounding 47 to the nearest 10.
Answer: 450
- 47 rounds to 50
- 50 × 9 = 450
The exact answer is 423.
7.Estimate 856 + 379 by rounding each number to the nearest 100.
Answer: 1,300
- 856 rounds to 900; 379 rounds to 400
- 900 + 400 = 1,300
The exact answer is 1,235, close to the estimate.
8.Estimate 65 × 6 by rounding 65 to the nearest 10.
Answer: 420
- 65 rounds to 70
- 70 × 6 = 420
The exact answer is 390.
9.Estimate 683 + 185 by rounding each number to the nearest 100.
Answer: 900
- 683 rounds to 700; 185 rounds to 200
- 700 + 200 = 900
The exact answer is 868, close to the estimate.
10.Estimate 61 × 5 by rounding 61 to the nearest 10.
Answer: 300
- 61 rounds to 60
- 60 × 5 = 300
The exact answer is 305.
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.