4th Grade Estimating Sums, Differences and Products Worksheet — Level 3 — 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 3 — Practice Set 2 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 9,081 + 4,577 by rounding each number to the nearest 100.
Answer: 13,700
- 9,081 rounds to 9,100; 4,577 rounds to 4,600
- 9,100 + 4,600 = 13,700
The exact answer is 13,658, close to the estimate.
2.Estimate 57 × 18 by rounding each number to the nearest 10.
Answer: 1,200
- 57 rounds to 60; 18 rounds to 20
- 60 × 20 = 1,200
The exact answer is 1,026.
3.Estimate 21 × 96 by rounding each number to the nearest 10.
Answer: 2,000
- 21 rounds to 20; 96 rounds to 100
- 20 × 100 = 2,000
The exact answer is 2,016.
4.Estimate 9,627 − 8,555 by rounding each number to the nearest 100.
Answer: 1,000
- 9,627 rounds to 9,600; 8,555 rounds to 8,600
- 9,600 − 8,600 = 1,000
The exact answer is 1,072, close to the estimate.
5.Estimate 55 × 92 by rounding each number to the nearest 10.
Answer: 5,400
- 55 rounds to 60; 92 rounds to 90
- 60 × 90 = 5,400
The exact answer is 5,060.
6.Estimate 34 × 51 by rounding each number to the nearest 10.
Answer: 1,500
- 34 rounds to 30; 51 rounds to 50
- 30 × 50 = 1,500
The exact answer is 1,734.
7.Estimate 7,569 − 2,572 by rounding each number to the nearest 1,000.
Answer: 5,000
- 7,569 rounds to 8,000; 2,572 rounds to 3,000
- 8,000 − 3,000 = 5,000
The exact answer is 4,997, close to the estimate.
8.Estimate 79 × 17 by rounding each number to the nearest 10.
Answer: 1,600
- 79 rounds to 80; 17 rounds to 20
- 80 × 20 = 1,600
The exact answer is 1,343.
9.Estimate 51 × 8 by rounding 51 to the nearest 10.
Answer: 400
- 51 rounds to 50
- 50 × 8 = 400
The exact answer is 408.
10.Estimate 9,747 − 1,897 by rounding each number to the nearest 1,000.
Answer: 8,000
- 9,747 rounds to 10,000; 1,897 rounds to 2,000
- 10,000 − 2,000 = 8,000
The exact answer is 7,850, close to the estimate.
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.