4th Grade Estimating Sums, Differences and Products Worksheet — Level 2 — Practice Set 3 — 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 3 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 547 − 322 by rounding each number to the nearest 100.
Answer: 200
- 547 rounds to 500; 322 rounds to 300
- 500 − 300 = 200
The exact answer is 225, close to the estimate.
2.Estimate 18 × 5 by rounding 18 to the nearest 10.
Answer: 100
- 18 rounds to 20
- 20 × 5 = 100
The exact answer is 90.
3.Estimate 103 + 347 by rounding each number to the nearest 100.
Answer: 400
- 103 rounds to 100; 347 rounds to 300
- 100 + 300 = 400
The exact answer is 450, close to the estimate.
4.Estimate 28 × 3 by rounding 28 to the nearest 10.
Answer: 90
- 28 rounds to 30
- 30 × 3 = 90
The exact answer is 84.
5.Estimate 972 − 635 by rounding each number to the nearest 100.
Answer: 400
- 972 rounds to 1,000; 635 rounds to 600
- 1,000 − 600 = 400
The exact answer is 337, close to the estimate.
6.Estimate 74 × 7 by rounding 74 to the nearest 10.
Answer: 490
- 74 rounds to 70
- 70 × 7 = 490
The exact answer is 518.
7.Estimate 740 − 258 by rounding each number to the nearest 100.
Answer: 400
- 740 rounds to 700; 258 rounds to 300
- 700 − 300 = 400
The exact answer is 482, close to the estimate.
8.Estimate 28 × 6 by rounding 28 to the nearest 10.
Answer: 180
- 28 rounds to 30
- 30 × 6 = 180
The exact answer is 168.
9.Estimate 150 + 266 by rounding each number to the nearest 100.
Answer: 500
- 150 rounds to 200; 266 rounds to 300
- 200 + 300 = 500
The exact answer is 416, close to the estimate.
10.Estimate 56 × 6 by rounding 56 to the nearest 10.
Answer: 360
- 56 rounds to 60
- 60 × 6 = 360
The exact answer is 336.
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.