4th Grade Estimating Sums, Differences and Products Worksheet — Level 3 — Practice Set 4 — 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 4 — Answers
Round each number first, then work out the estimate in your head.
1.Estimate 9,712 − 5,916 by rounding each number to the nearest 1,000.
Answer: 4,000
- 9,712 rounds to 10,000; 5,916 rounds to 6,000
- 10,000 − 6,000 = 4,000
The exact answer is 3,796, close to the estimate.
2.Estimate 24 × 54 by rounding each number to the nearest 10.
Answer: 1,000
- 24 rounds to 20; 54 rounds to 50
- 20 × 50 = 1,000
The exact answer is 1,296.
3.Estimate 22 × 5 by rounding 22 to the nearest 10.
Answer: 100
- 22 rounds to 20
- 20 × 5 = 100
The exact answer is 110.
4.Estimate 9,991 − 8,845 by rounding each number to the nearest 100.
Answer: 1,200
- 9,991 rounds to 10,000; 8,845 rounds to 8,800
- 10,000 − 8,800 = 1,200
The exact answer is 1,146, close to the estimate.
5.Estimate 74 × 13 by rounding each number to the nearest 10.
Answer: 700
- 74 rounds to 70; 13 rounds to 10
- 70 × 10 = 700
The exact answer is 962.
6.Estimate 26 × 8 by rounding 26 to the nearest 10.
Answer: 240
- 26 rounds to 30
- 30 × 8 = 240
The exact answer is 208.
7.Estimate 7,428 − 4,061 by rounding each number to the nearest 1,000.
Answer: 3,000
- 7,428 rounds to 7,000; 4,061 rounds to 4,000
- 7,000 − 4,000 = 3,000
The exact answer is 3,367, close to the estimate.
8.Estimate 39 × 33 by rounding each number to the nearest 10.
Answer: 1,200
- 39 rounds to 40; 33 rounds to 30
- 40 × 30 = 1,200
The exact answer is 1,287.
9.Estimate 74 × 55 by rounding each number to the nearest 10.
Answer: 4,200
- 74 rounds to 70; 55 rounds to 60
- 70 × 60 = 4,200
The exact answer is 4,070.
10.Estimate 9,075 − 3,921 by rounding each number to the nearest 100.
Answer: 5,200
- 9,075 rounds to 9,100; 3,921 rounds to 3,900
- 9,100 − 3,900 = 5,200
The exact answer is 5,154, close to the estimate.
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