Year 5 Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 2 — 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 2 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 454 − 310 by rounding each number to the nearest 100.
Answer: 200
- 454 rounds to 500; 310 rounds to 300
- 500 − 300 = 200
The exact answer is 144, close to the estimate.
2.Estimate 39 × 9 by rounding 39 to the nearest 10.
Answer: 360
- 39 rounds to 40
- 40 × 9 = 360
The exact answer is 351.
3.Estimate 586 + 599 by rounding each number to the nearest 100.
Answer: 1,200
- 586 rounds to 600; 599 rounds to 600
- 600 + 600 = 1,200
The exact answer is 1,185, close to the estimate.
4.Estimate 42 × 9 by rounding 42 to the nearest 10.
Answer: 360
- 42 rounds to 40
- 40 × 9 = 360
The exact answer is 378.
5.Estimate 471 − 294 by rounding each number to the nearest 100.
Answer: 200
- 471 rounds to 500; 294 rounds to 300
- 500 − 300 = 200
The exact answer is 177, close to the estimate.
6.Estimate 96 × 6 by rounding 96 to the nearest 10.
Answer: 600
- 96 rounds to 100
- 100 × 6 = 600
The exact answer is 576.
7.Estimate 361 − 286 by rounding each number to the nearest 100.
Answer: 100
- 361 rounds to 400; 286 rounds to 300
- 400 − 300 = 100
The exact answer is 75, close to the estimate.
8.Estimate 36 × 9 by rounding 36 to the nearest 10.
Answer: 360
- 36 rounds to 40
- 40 × 9 = 360
The exact answer is 324.
9.Estimate 338 − 112 by rounding each number to the nearest 100.
Answer: 200
- 338 rounds to 300; 112 rounds to 100
- 300 − 100 = 200
The exact answer is 226, close to the estimate.
10.Estimate 37 × 9 by rounding 37 to the nearest 10.
Answer: 360
- 37 rounds to 40
- 40 × 9 = 360
The exact answer is 333.
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.