Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 939 · 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 495 + 901 + 103? (a) 1500 (b) 1600 (c) 1700 (d) 1400
2. 2.Which is closest to 497 × 32? (Round each number first.) (a) 30000 (b) 15000 (c) 150000 (d) 1500
3. 3.Which is closest to 896 × 88? (Round each number first.) (a) 162000 (b) 81000 (c) 810000 (d) 8100
4. 4.Which is closest to 96 + 596 + 103? (a) 900 (b) 700 (c) 1000 (d) 800
5. 5.Which is closest to 596 × 89? (Round each number first.) (a) 108000 (b) 54000 (c) 540000 (d) 5400
6. 6.Which is closest to 602 × 52? (Round each number first.) (a) 60000 (b) 30000 (c) 3000 (d) 300000
7. 7.Round 53.64 to one decimal place. =
8. 8.Which is closest to 701 + 101 + 399? (a) 1400 (b) 1200 (c) 1100 (d) 1300
9. 9.Which is closest to 297 × 72? (Round each number first.) (a) 42000 (b) 21000 (c) 2100 (d) 210000
10. 10.Which is closest to 500 × 72? (Round each number first.) (a) 350000 (b) 3500 (c) 70000 (d) 35000
11. 11.Which is closest to 808 ÷ 19? (a) 40 (b) 80 (c) 400 (d) 20
12. 12.Which is closest to 796 + 495 + 805? (a) 2200 (b) 2100 (c) 2000 (d) 2300
13. 13.Which is closest to 295 + 802 + 897? (a) 2100 (b) 2000 (c) 1900 (d) 2200
14. 14.Which is closest to 700 × 71? (Round each number first.) (a) 49000 (b) 490000 (c) 98000 (d) 4900
15. 15.Which is closest to 395 + 204 + 495? (a) 1300 (b) 1100 (c) 1000 (d) 1200
16. 16.Round 34677 to the nearest hundred.
17. 17.Which is closest to 798 + 300 + 900? (a) 2100 (b) 2200 (c) 1900 (d) 2000
18. 18.Round 63.11 to one decimal place. =
19. 19.Which is closest to 704 × 29? (Round each number first.) (a) 42000 (b) 21000 (c) 210000 (d) 2100
20. 20.Round 23.88 to one decimal place. =
21. 21.Which is closest to 96 + 396 + 505? (a) 900 (b) 1100 (c) 1000 (d) 1200
22. 22.Which is closest to 897 × 71? (Round each number first.) (a) 63000 (b) 6300 (c) 126000 (d) 630000
23. 23.Which is closest to 299 × 90? (Round each number first.) (a) 270000 (b) 27000 (c) 2700 (d) 54000
24. 24.Round 18.08 to one decimal place. =
25. 25.Which is closest to 3609 ÷ 39? (a) 900 (b) 180 (c) 90 (d) 45
26. 26.Round 76937 to the nearest thousand.
27. 27.Which is closest to 897 + 502 + 803? (a) 2300 (b) 2400 (c) 2200 (d) 2100
28. 28.Which is closest to 600 × 38? (Round each number first.) (a) 24000 (b) 2400 (c) 48000 (d) 240000
29. 29.Which is closest to 304 × 29? (Round each number first.) (a) 90000 (b) 18000 (c) 900 (d) 9000
30. 30.Which is closest to 597 × 18? (Round each number first.) (a) 12000 (b) 24000 (c) 120000 (d) 1200
31. 31.Round 17989 to the nearest thousand.
32. 32.Which is closest to 902 × 41? (Round each number first.) (a) 72000 (b) 360000 (c) 3600 (d) 36000
33. 33.Which is closest to 404 + 695 + 905? (a) 2000 (b) 1900 (c) 2100 (d) 2200
34. 34.Round 35.14 to one decimal place. =
35. 35.Which is closest to 897 + 499 + 295? (a) 1600 (b) 1900 (c) 1800 (d) 1700
36. 36.Which is closest to 604 + 603 + 398? (a) 1600 (b) 1500 (c) 1700 (d) 1800
37. 37.Which is closest to 497 × 59? (Round each number first.) (a) 30000 (b) 3000 (c) 300000 (d) 60000
38. 38.Round 32.57 to one decimal place. =
39. 39.Which is closest to 697 × 22? (Round each number first.) (a) 14000 (b) 1400 (c) 140000 (d) 28000
40. 40.Which is closest to 702 + 304 + 704? (a) 1900 (b) 1800 (c) 1700 (d) 1600

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