Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 64 · 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 98 + 201 + 405? (a) 900 (b) 700 (c) 800 (d) 600
2. 2.Which is closest to 597 × 21? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
3. 3.Which is closest to 102 + 404 + 505? (a) 900 (b) 1000 (c) 1100 (d) 1200
4. 4.Which is closest to 1398 ÷ 21? (a) 140 (b) 70 (c) 35 (d) 700
5. 5.Which is closest to 395 + 195 + 104? (a) 900 (b) 700 (c) 800 (d) 600
6. 6.Which is closest to 596 + 105 + 698? (a) 1300 (b) 1400 (c) 1500 (d) 1600
7. 7.Round 57.73 to one decimal place. =
8. 8.Which is closest to 399 + 399 + 405? (a) 1400 (b) 1300 (c) 1200 (d) 1100
9. 9.Round 7103 to the nearest hundred.
10. 10.Which is closest to 897 × 71? (Round each number first.) (a) 6300 (b) 126000 (c) 63000 (d) 630000
11. 11.Which is closest to 595 + 897 + 298? (a) 1900 (b) 1700 (c) 2000 (d) 1800
12. 12.Round 83531 to the nearest hundred.
13. 13.Round 68422 to the nearest hundred.
14. 14.Which is closest to 204 × 61? (Round each number first.) (a) 12000 (b) 120000 (c) 24000 (d) 1200
15. 15.Round 48252 to the nearest ten.
16. 16.Which is closest to 401 × 68? (Round each number first.) (a) 2800 (b) 56000 (c) 28000 (d) 280000
17. 17.Round 55945 to the nearest thousand.
18. 18.Which is closest to 1493 ÷ 49? (a) 15 (b) 300 (c) 30 (d) 60
19. 19.Round 8347 to the nearest hundred.
20. 20.Round 71229 to the nearest ten.
21. 21.Round 44.81 to one decimal place. =
22. 22.Which is closest to 902 + 305 + 298? (a) 1500 (b) 1400 (c) 1700 (d) 1600
23. 23.Round 17.81 to one decimal place. =
24. 24.Which is closest to 897 × 88? (Round each number first.) (a) 81000 (b) 810000 (c) 8100 (d) 162000
25. 25.Which is closest to 704 + 105 + 101? (a) 1000 (b) 900 (c) 800 (d) 1100
26. 26.Which is closest to 601 + 900 + 898? (a) 2300 (b) 2400 (c) 2600 (d) 2500
27. 27.Round 30325 to the nearest thousand.
28. 28.Which is closest to 902 × 18? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000
29. 29.Round 19.08 to one decimal place. =
30. 30.Which is closest to 698 + 205 + 201? (a) 1200 (b) 1000 (c) 1100 (d) 1300
31. 31.Which is closest to 496 × 81? (Round each number first.) (a) 80000 (b) 40000 (c) 4000 (d) 400000
32. 32.Which is closest to 796 × 31? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
33. 33.Round 30864 to the nearest thousand.
34. 34.Which is closest to 304 × 40? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
35. 35.Which is closest to 800 + 205 + 903? (a) 1800 (b) 1900 (c) 2000 (d) 2100
36. 36.Which is closest to 296 × 28? (Round each number first.) (a) 9000 (b) 90000 (c) 900 (d) 18000
37. 37.Round 53577 to the nearest ten.
38. 38.Round 3478 to the nearest hundred.
39. 39.Which is closest to 603 ÷ 29? (a) 10 (b) 40 (c) 200 (d) 20
40. 40.Round 70.61 to one decimal place. =

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