5th Grade Estimating Sums, Differences and Products Worksheet — Level 3 — Practice Set 3 — 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 3 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 3,678 − 3,287 by rounding each number to the nearest 1,000.
Answer: 1,000
- 3,678 rounds to 4,000; 3,287 rounds to 3,000
- 4,000 − 3,000 = 1,000
The exact answer is 391, close to the estimate.
2.Estimate 72 × 81 by rounding each number to the nearest 10.
Answer: 5,600
- 72 rounds to 70; 81 rounds to 80
- 70 × 80 = 5,600
The exact answer is 5,832.
3.Estimate 84 × 6 by rounding 84 to the nearest 10.
Answer: 480
- 84 rounds to 80
- 80 × 6 = 480
The exact answer is 504.
4.Estimate 4,129 + 3,017 by rounding each number to the nearest 100.
Answer: 7,100
- 4,129 rounds to 4,100; 3,017 rounds to 3,000
- 4,100 + 3,000 = 7,100
The exact answer is 7,146, close to the estimate.
5.Estimate 16 × 45 by rounding each number to the nearest 10.
Answer: 1,000
- 16 rounds to 20; 45 rounds to 50
- 20 × 50 = 1,000
The exact answer is 720.
6.Estimate 87 × 8 by rounding 87 to the nearest 10.
Answer: 720
- 87 rounds to 90
- 90 × 8 = 720
The exact answer is 696.
7.Estimate 8,014 − 3,897 by rounding each number to the nearest 100.
Answer: 4,100
- 8,014 rounds to 8,000; 3,897 rounds to 3,900
- 8,000 − 3,900 = 4,100
The exact answer is 4,117, close to the estimate.
8.Estimate 81 × 93 by rounding each number to the nearest 10.
Answer: 7,200
- 81 rounds to 80; 93 rounds to 90
- 80 × 90 = 7,200
The exact answer is 7,533.
9.Estimate 72 × 4 by rounding 72 to the nearest 10.
Answer: 280
- 72 rounds to 70
- 70 × 4 = 280
The exact answer is 288.
10.Estimate 6,013 − 1,411 by rounding each number to the nearest 100.
Answer: 4,600
- 6,013 rounds to 6,000; 1,411 rounds to 1,400
- 6,000 − 1,400 = 4,600
The exact answer is 4,602, close to the estimate.
Marking tips
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