Year 5 Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 4 — 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 4 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 334 + 681 by rounding each number to the nearest 100.
Answer: 1,000
- 334 rounds to 300; 681 rounds to 700
- 300 + 700 = 1,000
The exact answer is 1,015, close to the estimate.
2.Estimate 78 × 9 by rounding 78 to the nearest 10.
Answer: 720
- 78 rounds to 80
- 80 × 9 = 720
The exact answer is 702.
3.Estimate 806 + 234 by rounding each number to the nearest 100.
Answer: 1,000
- 806 rounds to 800; 234 rounds to 200
- 800 + 200 = 1,000
The exact answer is 1,040, close to the estimate.
4.Estimate 67 × 3 by rounding 67 to the nearest 10.
Answer: 210
- 67 rounds to 70
- 70 × 3 = 210
The exact answer is 201.
5.Estimate 708 + 833 by rounding each number to the nearest 100.
Answer: 1,500
- 708 rounds to 700; 833 rounds to 800
- 700 + 800 = 1,500
The exact answer is 1,541, close to the estimate.
6.Estimate 59 × 4 by rounding 59 to the nearest 10.
Answer: 240
- 59 rounds to 60
- 60 × 4 = 240
The exact answer is 236.
7.Estimate 686 + 823 by rounding each number to the nearest 100.
Answer: 1,500
- 686 rounds to 700; 823 rounds to 800
- 700 + 800 = 1,500
The exact answer is 1,509, close to the estimate.
8.Estimate 58 × 5 by rounding 58 to the nearest 10.
Answer: 300
- 58 rounds to 60
- 60 × 5 = 300
The exact answer is 290.
9.Estimate 350 + 833 by rounding each number to the nearest 100.
Answer: 1,200
- 350 rounds to 400; 833 rounds to 800
- 400 + 800 = 1,200
The exact answer is 1,183, close to the estimate.
10.Estimate 82 × 3 by rounding 82 to the nearest 10.
Answer: 240
- 82 rounds to 80
- 80 × 3 = 240
The exact answer is 246.
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.