4th Grade Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 4 — Answers
Answer sheet with worked solutions for the 4th Grade place value worksheet.
Success TutoringWorksheetsAnswer sheet4th Grade · Mathematics · Place Value4th Grade 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 472 + 804 by rounding each number to the nearest 100.
Answer: 1,300
- 472 rounds to 500; 804 rounds to 800
- 500 + 800 = 1,300
The exact answer is 1,276, close to the estimate.
2.Estimate 25 × 8 by rounding 25 to the nearest 10.
Answer: 240
- 25 rounds to 30
- 30 × 8 = 240
The exact answer is 200.
3.Estimate 510 − 296 by rounding each number to the nearest 100.
Answer: 200
- 510 rounds to 500; 296 rounds to 300
- 500 − 300 = 200
The exact answer is 214, close to the estimate.
4.Estimate 31 × 3 by rounding 31 to the nearest 10.
Answer: 90
- 31 rounds to 30
- 30 × 3 = 90
The exact answer is 93.
5.Estimate 710 − 217 by rounding each number to the nearest 100.
Answer: 500
- 710 rounds to 700; 217 rounds to 200
- 700 − 200 = 500
The exact answer is 493, close to the estimate.
6.Estimate 51 × 9 by rounding 51 to the nearest 10.
Answer: 450
- 51 rounds to 50
- 50 × 9 = 450
The exact answer is 459.
7.Estimate 820 + 223 by rounding each number to the nearest 100.
Answer: 1,000
- 820 rounds to 800; 223 rounds to 200
- 800 + 200 = 1,000
The exact answer is 1,043, close to the estimate.
8.Estimate 34 × 7 by rounding 34 to the nearest 10.
Answer: 210
- 34 rounds to 30
- 30 × 7 = 210
The exact answer is 238.
9.Estimate 546 + 708 by rounding each number to the nearest 100.
Answer: 1,200
- 546 rounds to 500; 708 rounds to 700
- 500 + 700 = 1,200
The exact answer is 1,254, close to the estimate.
10.Estimate 53 × 9 by rounding 53 to the nearest 10.
Answer: 450
- 53 rounds to 50
- 50 × 9 = 450
The exact answer is 477.
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.