Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 539 · 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 505 + 900 + 701? (a) 2200 (b) 2300 (c) 2000 (d) 2100
2. 2.Which is closest to 503 × 40? (Round each number first.) (a) 200000 (b) 40000 (c) 2000 (d) 20000
3. 3.Which is closest to 298 × 42? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
4. 4.Which is closest to 2096 ÷ 31? (a) 35 (b) 140 (c) 700 (d) 70
5. 5.Round 9224 to the nearest ten.
6. 6.Round 19.27 to one decimal place. =
7. 7.Which is closest to 701 + 302 + 596? (a) 1600 (b) 1700 (c) 1800 (d) 1500
8. 8.Round 74511 to the nearest hundred.
9. 9.Round 34114 to the nearest hundred.
10. 10.Which is closest to 501 + 698 + 795? (a) 2100 (b) 2200 (c) 1900 (d) 2000
11. 11.Round 97.67 to one decimal place. =
12. 12.Which is closest to 798 ÷ 39? (a) 10 (b) 20 (c) 40 (d) 200
13. 13.Which is closest to 504 × 39? (Round each number first.) (a) 20000 (b) 40000 (c) 200000 (d) 2000
14. 14.Which is closest to 1204 ÷ 29? (a) 40 (b) 20 (c) 400 (d) 80
15. 15.Round 23546 to the nearest ten.
16. 16.Which is closest to 797 × 82? (Round each number first.) (a) 64000 (b) 640000 (c) 128000 (d) 6400
17. 17.Round 26.88 to one decimal place. =
18. 18.Which is closest to 498 × 78? (Round each number first.) (a) 400000 (b) 80000 (c) 40000 (d) 4000
19. 19.Which is closest to 496 × 79? (Round each number first.) (a) 4000 (b) 400000 (c) 80000 (d) 40000
20. 20.Round 63637 to the nearest ten.
21. 21.Round 6423 to the nearest thousand.
22. 22.Which is closest to 602 × 82? (Round each number first.) (a) 480000 (b) 48000 (c) 4800 (d) 96000
23. 23.Which is closest to 2002 ÷ 49? (a) 80 (b) 20 (c) 40 (d) 400
24. 24.Which is closest to 404 × 22? (Round each number first.) (a) 80000 (b) 800 (c) 8000 (d) 16000
25. 25.Round 75.38 to one decimal place. =
26. 26.Which is closest to 597 × 78? (Round each number first.) (a) 480000 (b) 4800 (c) 48000 (d) 96000
27. 27.Round 75732 to the nearest ten.
28. 28.Round 12.54 to one decimal place. =
29. 29.Which is closest to 2008 ÷ 51? (a) 80 (b) 400 (c) 20 (d) 40
30. 30.Round 20427 to the nearest thousand.
31. 31.Round 62543 to the nearest hundred.
32. 32.Round 52.84 to one decimal place. =
33. 33.Which is closest to 797 × 32? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
34. 34.Which is closest to 397 + 205 + 304? (a) 1100 (b) 900 (c) 800 (d) 1000
35. 35.Which is closest to 402 × 71? (Round each number first.) (a) 2800 (b) 56000 (c) 28000 (d) 280000
36. 36.Which is closest to 201 + 899 + 304? (a) 1400 (b) 1600 (c) 1300 (d) 1500
37. 37.Which is closest to 796 + 701 + 504? (a) 1900 (b) 2000 (c) 2100 (d) 2200
38. 38.Which is closest to 296 + 304 + 895? (a) 1600 (b) 1500 (c) 1700 (d) 1400
39. 39.Round 75.63 to one decimal place. =
40. 40.Which is closest to 897 + 302 + 499? (a) 1600 (b) 1900 (c) 1700 (d) 1800

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