Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 171 · 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 401 × 59? (Round each number first.) (a) 24000 (b) 48000 (c) 240000 (d) 2400
2. 2.Which is closest to 502 + 500 + 202? (a) 1200 (b) 1400 (c) 1100 (d) 1300
3. 3.Which is closest to 403 × 28? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
4. 4.Which is closest to 302 + 300 + 697? (a) 1500 (b) 1200 (c) 1400 (d) 1300
5. 5.Round 37.18 to one decimal place. =
6. 6.Which is closest to 804 × 81? (Round each number first.) (a) 64000 (b) 128000 (c) 640000 (d) 6400
7. 7.Which is closest to 599 × 58? (Round each number first.) (a) 3600 (b) 360000 (c) 36000 (d) 72000
8. 8.Round 84859 to the nearest hundred.
9. 9.Which is closest to 203 × 48? (Round each number first.) (a) 10000 (b) 20000 (c) 1000 (d) 100000
10. 10.Which is closest to 2699 ÷ 29? (a) 900 (b) 90 (c) 180 (d) 45
11. 11.Which is closest to 1199 ÷ 39? (a) 30 (b) 60 (c) 15 (d) 300
12. 12.Round 26840 to the nearest thousand.
13. 13.Which is closest to 702 × 42? (Round each number first.) (a) 28000 (b) 2800 (c) 56000 (d) 280000
14. 14.Which is closest to 497 × 68? (Round each number first.) (a) 3500 (b) 350000 (c) 70000 (d) 35000
15. 15.Which is closest to 398 + 905 + 902? (a) 2100 (b) 2200 (c) 2300 (d) 2400
16. 16.Which is closest to 399 + 795 + 405? (a) 1800 (b) 1600 (c) 1500 (d) 1700
17. 17.Which is closest to 297 × 70? (Round each number first.) (a) 21000 (b) 42000 (c) 210000 (d) 2100
18. 18.Which is closest to 603 × 22? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
19. 19.Round 13.86 to one decimal place. =
20. 20.Round 81.88 to one decimal place. =
21. 21.Which is closest to 599 + 699 + 403? (a) 1800 (b) 1700 (c) 1900 (d) 1600
22. 22.Which is closest to 602 + 896 + 796? (a) 2500 (b) 2400 (c) 2200 (d) 2300
23. 23.Round 4792 to the nearest ten.
24. 24.Which is closest to 598 + 597 + 299? (a) 1400 (b) 1700 (c) 1500 (d) 1600
25. 25.Round 54892 to the nearest hundred.
26. 26.Round 65.39 to one decimal place. =
27. 27.Round 63.83 to one decimal place. =
28. 28.Which is closest to 699 × 59? (Round each number first.) (a) 420000 (b) 4200 (c) 84000 (d) 42000
29. 29.Which is closest to 304 × 32? (Round each number first.) (a) 9000 (b) 18000 (c) 900 (d) 90000
30. 30.Which is closest to 2392 ÷ 41? (a) 600 (b) 120 (c) 30 (d) 60
31. 31.Which is closest to 903 × 90? (Round each number first.) (a) 8100 (b) 81000 (c) 810000 (d) 162000
32. 32.Which is closest to 601 ÷ 31? (a) 200 (b) 20 (c) 10 (d) 40
33. 33.Round 98.39 to one decimal place. =
34. 34.Which is closest to 398 × 30? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
35. 35.Round 24845 to the nearest hundred.
36. 36.Which is closest to 302 + 100 + 501? (a) 800 (b) 1000 (c) 900 (d) 1100
37. 37.Which is closest to 603 × 80? (Round each number first.) (a) 480000 (b) 96000 (c) 48000 (d) 4800
38. 38.Round 58084 to the nearest thousand.
39. 39.Which is closest to 499 + 601 + 896? (a) 1900 (b) 2200 (c) 2000 (d) 2100
40. 40.Which is closest to 596 ÷ 31? (a) 10 (b) 20 (c) 200 (d) 40

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