Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 306 · 40 questions

The method (Round, then calculate): Round each number to the nearest ten, hundred or whole number. Do the easy sum with the rounded numbers. Pick the option nearest to it. To round a number, look at the digit after the place you keep: 5 or more goes up, less than 5 stays.

1. 1.Which is closest to 397 × 32? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
2. 2.Round 14.43 to one decimal place. =
3. 3.Which is closest to 898 + 804 + 501? (a) 2300 (b) 2200 (c) 2100 (d) 2400
4. 4.Which is closest to 602 + 196 + 298? (a) 1100 (b) 1000 (c) 1300 (d) 1200
5. 5.Which is closest to 4493 ÷ 49? (a) 900 (b) 90 (c) 180 (d) 45
6. 6.Round 72.59 to one decimal place. =
7. 7.Round 88.49 to one decimal place. =
8. 8.Which is closest to 300 × 31? (Round each number first.) (a) 9000 (b) 900 (c) 18000 (d) 90000
9. 9.Which is closest to 500 + 799 + 96? (a) 1500 (b) 1400 (c) 1600 (d) 1300
10. 10.Which is closest to 696 × 59? (Round each number first.) (a) 84000 (b) 42000 (c) 420000 (d) 4200
11. 11.Round 93503 to the nearest thousand.
12. 12.Which is closest to 900 + 897 + 896? (a) 2700 (b) 2900 (c) 2600 (d) 2800
13. 13.Which is closest to 799 × 69? (Round each number first.) (a) 112000 (b) 56000 (c) 560000 (d) 5600
14. 14.Which is closest to 600 × 69? (Round each number first.) (a) 84000 (b) 42000 (c) 420000 (d) 4200
15. 15.Round 27.14 to one decimal place. =
16. 16.Which is closest to 504 + 99 + 499? (a) 1100 (b) 1000 (c) 1300 (d) 1200
17. 17.Round 95300 to the nearest thousand.
18. 18.Which is closest to 503 × 91? (Round each number first.) (a) 45000 (b) 4500 (c) 450000 (d) 90000
19. 19.Round 44814 to the nearest ten.
20. 20.Round 68.84 to one decimal place. =
21. 21.Which is closest to 2700 ÷ 31? (a) 45 (b) 900 (c) 90 (d) 180
22. 22.Round 39934 to the nearest hundred.
23. 23.Which is closest to 200 × 89? (Round each number first.) (a) 36000 (b) 18000 (c) 1800 (d) 180000
24. 24.Round 21.57 to one decimal place. =
25. 25.Round 32029 to the nearest ten.
26. 26.Round 63.47 to one decimal place. =
27. 27.Round 69109 to the nearest hundred.
28. 28.Which is closest to 897 × 21? (Round each number first.) (a) 180000 (b) 36000 (c) 18000 (d) 1800
29. 29.Which is closest to 806 ÷ 41? (a) 40 (b) 200 (c) 10 (d) 20
30. 30.Round 66.42 to one decimal place. =
31. 31.Round 73284 to the nearest ten.
32. 32.Which is closest to 899 + 96 + 103? (a) 1000 (b) 1200 (c) 1300 (d) 1100
33. 33.Round 26556 to the nearest thousand.
34. 34.Which is closest to 605 + 199 + 899? (a) 1900 (b) 1600 (c) 1700 (d) 1800
35. 35.Which is closest to 595 + 900 + 595? (a) 2100 (b) 2200 (c) 2000 (d) 2300
36. 36.Round 66.39 to one decimal place. =
37. 37.Which is closest to 604 + 197 + 198? (a) 900 (b) 1200 (c) 1100 (d) 1000
38. 38.Round 12615 to the nearest thousand.
39. 39.Which is closest to 993 ÷ 49? (a) 200 (b) 10 (c) 20 (d) 40
40. 40.Which is closest to 303 × 51? (Round each number first.) (a) 150000 (b) 15000 (c) 1500 (d) 30000

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