5th Grade Estimating Sums, Differences and Products Worksheet — Level 3 — Practice Set 2 — Answers
Answer sheet with worked solutions for the 5th Grade place value worksheet.
Success TutoringWorksheetsAnswer sheet5th Grade · Mathematics · Place Value5th 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 2,189 + 1,733 by rounding each number to the nearest 100.
Answer: 3,900
- 2,189 rounds to 2,200; 1,733 rounds to 1,700
- 2,200 + 1,700 = 3,900
The exact answer is 3,922, close to the estimate.
2.Estimate 66 × 31 by rounding each number to the nearest 10.
Answer: 2,100
- 66 rounds to 70; 31 rounds to 30
- 70 × 30 = 2,100
The exact answer is 2,046.
3.Estimate 28 × 42 by rounding each number to the nearest 10.
Answer: 1,200
- 28 rounds to 30; 42 rounds to 40
- 30 × 40 = 1,200
The exact answer is 1,176.
4.Estimate 7,919 − 7,727 by rounding each number to the nearest 100.
Answer: 200
- 7,919 rounds to 7,900; 7,727 rounds to 7,700
- 7,900 − 7,700 = 200
The exact answer is 192, close to the estimate.
5.Estimate 66 × 64 by rounding each number to the nearest 10.
Answer: 4,200
- 66 rounds to 70; 64 rounds to 60
- 70 × 60 = 4,200
The exact answer is 4,224.
6.Estimate 78 × 33 by rounding each number to the nearest 10.
Answer: 2,400
- 78 rounds to 80; 33 rounds to 30
- 80 × 30 = 2,400
The exact answer is 2,574.
7.Estimate 8,547 − 4,628 by rounding each number to the nearest 1,000.
Answer: 4,000
- 8,547 rounds to 9,000; 4,628 rounds to 5,000
- 9,000 − 5,000 = 4,000
The exact answer is 3,919, close to the estimate.
8.Estimate 29 × 84 by rounding each number to the nearest 10.
Answer: 2,400
- 29 rounds to 30; 84 rounds to 80
- 30 × 80 = 2,400
The exact answer is 2,436.
9.Estimate 71 × 3 by rounding 71 to the nearest 10.
Answer: 210
- 71 rounds to 70
- 70 × 3 = 210
The exact answer is 213.
10.Estimate 6,421 − 1,882 by rounding each number to the nearest 1,000.
Answer: 4,000
- 6,421 rounds to 6,000; 1,882 rounds to 2,000
- 6,000 − 2,000 = 4,000
The exact answer is 4,539, 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.