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 428 + 270 by rounding each number to the nearest 100.
Answer: 700
- 428 rounds to 400; 270 rounds to 300
- 400 + 300 = 700
The exact answer is 698, close to the estimate.
2.Estimate 25 × 3 by rounding 25 to the nearest 10.
Answer: 90
- 25 rounds to 30
- 30 × 3 = 90
The exact answer is 75.
3.Estimate 809 + 237 by rounding each number to the nearest 100.
Answer: 1,000
- 809 rounds to 800; 237 rounds to 200
- 800 + 200 = 1,000
The exact answer is 1,046, close to the estimate.
4.Estimate 53 × 6 by rounding 53 to the nearest 10.
Answer: 300
- 53 rounds to 50
- 50 × 6 = 300
The exact answer is 318.
5.Estimate 624 + 797 by rounding each number to the nearest 100.
Answer: 1,400
- 624 rounds to 600; 797 rounds to 800
- 600 + 800 = 1,400
The exact answer is 1,421, close to the estimate.
6.Estimate 43 × 6 by rounding 43 to the nearest 10.
Answer: 240
- 43 rounds to 40
- 40 × 6 = 240
The exact answer is 258.
7.Estimate 817 − 361 by rounding each number to the nearest 100.
Answer: 400
- 817 rounds to 800; 361 rounds to 400
- 800 − 400 = 400
The exact answer is 456, close to the estimate.
8.Estimate 44 × 3 by rounding 44 to the nearest 10.
Answer: 120
- 44 rounds to 40
- 40 × 3 = 120
The exact answer is 132.
9.Estimate 928 − 337 by rounding each number to the nearest 100.
Answer: 600
- 928 rounds to 900; 337 rounds to 300
- 900 − 300 = 600
The exact answer is 591, close to the estimate.
10.Estimate 17 × 4 by rounding 17 to the nearest 10.
Answer: 80
- 17 rounds to 20
- 20 × 4 = 80
The exact answer is 68.
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.