4th Grade Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 2 — 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 2 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 670 + 493 by rounding each number to the nearest 100.
Answer: 1,200
- 670 rounds to 700; 493 rounds to 500
- 700 + 500 = 1,200
The exact answer is 1,163, close to the estimate.
2.Estimate 98 × 9 by rounding 98 to the nearest 10.
Answer: 900
- 98 rounds to 100
- 100 × 9 = 900
The exact answer is 882.
3.Estimate 557 + 569 by rounding each number to the nearest 100.
Answer: 1,200
- 557 rounds to 600; 569 rounds to 600
- 600 + 600 = 1,200
The exact answer is 1,126, close to the estimate.
4.Estimate 24 × 6 by rounding 24 to the nearest 10.
Answer: 120
- 24 rounds to 20
- 20 × 6 = 120
The exact answer is 144.
5.Estimate 843 + 826 by rounding each number to the nearest 100.
Answer: 1,600
- 843 rounds to 800; 826 rounds to 800
- 800 + 800 = 1,600
The exact answer is 1,669, close to the estimate.
6.Estimate 82 × 4 by rounding 82 to the nearest 10.
Answer: 320
- 82 rounds to 80
- 80 × 4 = 320
The exact answer is 328.
7.Estimate 816 + 207 by rounding each number to the nearest 100.
Answer: 1,000
- 816 rounds to 800; 207 rounds to 200
- 800 + 200 = 1,000
The exact answer is 1,023, close to the estimate.
8.Estimate 99 × 3 by rounding 99 to the nearest 10.
Answer: 300
- 99 rounds to 100
- 100 × 3 = 300
The exact answer is 297.
9.Estimate 930 − 457 by rounding each number to the nearest 100.
Answer: 400
- 930 rounds to 900; 457 rounds to 500
- 900 − 500 = 400
The exact answer is 473, close to the estimate.
10.Estimate 53 × 8 by rounding 53 to the nearest 10.
Answer: 400
- 53 rounds to 50
- 50 × 8 = 400
The exact answer is 424.
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.