Year 4 Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 4 — Answers
Answer sheet with worked solutions for the Year 4 place value worksheet.
Success TutoringWorksheetsAnswer sheetYear 4 · Mathematics · Place ValueYear 4 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 563 + 776 by rounding each number to the nearest 100.
Answer: 1,400
- 563 rounds to 600; 776 rounds to 800
- 600 + 800 = 1,400
The exact answer is 1,339, close to the estimate.
2.Estimate 79 × 9 by rounding 79 to the nearest 10.
Answer: 720
- 79 rounds to 80
- 80 × 9 = 720
The exact answer is 711.
3.Estimate 426 + 647 by rounding each number to the nearest 100.
Answer: 1,000
- 426 rounds to 400; 647 rounds to 600
- 400 + 600 = 1,000
The exact answer is 1,073, close to the estimate.
4.Estimate 45 × 7 by rounding 45 to the nearest 10.
Answer: 350
- 45 rounds to 50
- 50 × 7 = 350
The exact answer is 315.
5.Estimate 150 + 179 by rounding each number to the nearest 100.
Answer: 400
- 150 rounds to 200; 179 rounds to 200
- 200 + 200 = 400
The exact answer is 329, close to the estimate.
6.Estimate 82 × 8 by rounding 82 to the nearest 10.
Answer: 640
- 82 rounds to 80
- 80 × 8 = 640
The exact answer is 656.
7.Estimate 253 + 357 by rounding each number to the nearest 100.
Answer: 700
- 253 rounds to 300; 357 rounds to 400
- 300 + 400 = 700
The exact answer is 610, close to the estimate.
8.Estimate 27 × 4 by rounding 27 to the nearest 10.
Answer: 120
- 27 rounds to 30
- 30 × 4 = 120
The exact answer is 108.
9.Estimate 890 − 814 by rounding each number to the nearest 100.
Answer: 100
- 890 rounds to 900; 814 rounds to 800
- 900 − 800 = 100
The exact answer is 76, close to the estimate.
10.Estimate 44 × 4 by rounding 44 to the nearest 10.
Answer: 160
- 44 rounds to 40
- 40 × 4 = 160
The exact answer is 176.
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.