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 978 − 312 by rounding each number to the nearest 100.
Answer: 700
- 978 rounds to 1,000; 312 rounds to 300
- 1,000 − 300 = 700
The exact answer is 666, close to the estimate.
2.Estimate 56 × 6 by rounding 56 to the nearest 10.
Answer: 360
- 56 rounds to 60
- 60 × 6 = 360
The exact answer is 336.
3.Estimate 488 + 680 by rounding each number to the nearest 100.
Answer: 1,200
- 488 rounds to 500; 680 rounds to 700
- 500 + 700 = 1,200
The exact answer is 1,168, close to the estimate.
4.Estimate 62 × 6 by rounding 62 to the nearest 10.
Answer: 360
- 62 rounds to 60
- 60 × 6 = 360
The exact answer is 372.
5.Estimate 917 − 610 by rounding each number to the nearest 100.
Answer: 300
- 917 rounds to 900; 610 rounds to 600
- 900 − 600 = 300
The exact answer is 307, close to the estimate.
6.Estimate 31 × 6 by rounding 31 to the nearest 10.
Answer: 180
- 31 rounds to 30
- 30 × 6 = 180
The exact answer is 186.
7.Estimate 979 − 770 by rounding each number to the nearest 100.
Answer: 200
- 979 rounds to 1,000; 770 rounds to 800
- 1,000 − 800 = 200
The exact answer is 209, close to the estimate.
8.Estimate 37 × 4 by rounding 37 to the nearest 10.
Answer: 160
- 37 rounds to 40
- 40 × 4 = 160
The exact answer is 148.
9.Estimate 772 − 134 by rounding each number to the nearest 100.
Answer: 700
- 772 rounds to 800; 134 rounds to 100
- 800 − 100 = 700
The exact answer is 638, close to the estimate.
10.Estimate 52 × 4 by rounding 52 to the nearest 10.
Answer: 200
- 52 rounds to 50
- 50 × 4 = 200
The exact answer is 208.
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.