Year 5 Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 3 — Answers
Answer sheet with worked solutions for the Year 5 place value worksheet.
Success TutoringWorksheetsAnswer sheetYear 5 · Mathematics · Place ValueYear 5 Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 3 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 791 − 408 by rounding each number to the nearest 100.
Answer: 400
- 791 rounds to 800; 408 rounds to 400
- 800 − 400 = 400
The exact answer is 383, close to the estimate.
2.Estimate 67 × 3 by rounding 67 to the nearest 10.
Answer: 210
- 67 rounds to 70
- 70 × 3 = 210
The exact answer is 201.
3.Estimate 596 − 327 by rounding each number to the nearest 100.
Answer: 300
- 596 rounds to 600; 327 rounds to 300
- 600 − 300 = 300
The exact answer is 269, close to the estimate.
4.Estimate 99 × 9 by rounding 99 to the nearest 10.
Answer: 900
- 99 rounds to 100
- 100 × 9 = 900
The exact answer is 891.
5.Estimate 741 + 623 by rounding each number to the nearest 100.
Answer: 1,300
- 741 rounds to 700; 623 rounds to 600
- 700 + 600 = 1,300
The exact answer is 1,364, close to the estimate.
6.Estimate 25 × 8 by rounding 25 to the nearest 10.
Answer: 240
- 25 rounds to 30
- 30 × 8 = 240
The exact answer is 200.
7.Estimate 614 + 664 by rounding each number to the nearest 100.
Answer: 1,300
- 614 rounds to 600; 664 rounds to 700
- 600 + 700 = 1,300
The exact answer is 1,278, close to the estimate.
8.Estimate 54 × 8 by rounding 54 to the nearest 10.
Answer: 400
- 54 rounds to 50
- 50 × 8 = 400
The exact answer is 432.
9.Estimate 269 + 759 by rounding each number to the nearest 100.
Answer: 1,100
- 269 rounds to 300; 759 rounds to 800
- 300 + 800 = 1,100
The exact answer is 1,028, close to the estimate.
10.Estimate 21 × 9 by rounding 21 to the nearest 10.
Answer: 180
- 21 rounds to 20
- 20 × 9 = 180
The exact answer is 189.
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.