3rd Grade Estimating Sums, Differences and Products Worksheet — Level 3 — Practice Set 4 — Answers
Answer sheet with worked solutions for the 3rd Grade place value worksheet.
Success TutoringWorksheetsAnswer sheet3rd Grade · Mathematics · Place Value3rd 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 7,062 + 7,662 by rounding each number to the nearest 1,000.
Answer: 15,000
- 7,062 rounds to 7,000; 7,662 rounds to 8,000
- 7,000 + 8,000 = 15,000
The exact answer is 14,724, close to the estimate.
2.Estimate 42 × 57 by rounding each number to the nearest 10.
Answer: 2,400
- 42 rounds to 40; 57 rounds to 60
- 40 × 60 = 2,400
The exact answer is 2,394.
3.Estimate 64 × 4 by rounding 64 to the nearest 10.
Answer: 240
- 64 rounds to 60
- 60 × 4 = 240
The exact answer is 256.
4.Estimate 8,842 − 5,138 by rounding each number to the nearest 1,000.
Answer: 4,000
- 8,842 rounds to 9,000; 5,138 rounds to 5,000
- 9,000 − 5,000 = 4,000
The exact answer is 3,704, close to the estimate.
5.Estimate 94 × 95 by rounding each number to the nearest 10.
Answer: 9,000
- 94 rounds to 90; 95 rounds to 100
- 90 × 100 = 9,000
The exact answer is 8,930.
6.Estimate 54 × 39 by rounding each number to the nearest 10.
Answer: 2,000
- 54 rounds to 50; 39 rounds to 40
- 50 × 40 = 2,000
The exact answer is 2,106.
7.Estimate 1,854 + 9,447 by rounding each number to the nearest 100.
Answer: 11,300
- 1,854 rounds to 1,900; 9,447 rounds to 9,400
- 1,900 + 9,400 = 11,300
The exact answer is 11,301, close to the estimate.
8.Estimate 32 × 14 by rounding each number to the nearest 10.
Answer: 300
- 32 rounds to 30; 14 rounds to 10
- 30 × 10 = 300
The exact answer is 448.
9.Estimate 38 × 9 by rounding 38 to the nearest 10.
Answer: 360
- 38 rounds to 40
- 40 × 9 = 360
The exact answer is 342.
10.Estimate 8,975 − 1,426 by rounding each number to the nearest 100.
Answer: 7,600
- 8,975 rounds to 9,000; 1,426 rounds to 1,400
- 9,000 − 1,400 = 7,600
The exact answer is 7,549, close to the estimate.
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