Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 559 · 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.Round 15746 to the nearest thousand.
2. 2.Which is closest to 2700 ÷ 29? (a) 180 (b) 90 (c) 45 (d) 900
3. 3.Which is closest to 602 + 598 + 297? (a) 1500 (b) 1400 (c) 1600 (d) 1700
4. 4.Which is closest to 703 × 28? (Round each number first.) (a) 42000 (b) 210000 (c) 21000 (d) 2100
5. 5.Which is closest to 2698 ÷ 29? (a) 180 (b) 900 (c) 45 (d) 90
6. 6.Which is closest to 400 × 18? (Round each number first.) (a) 16000 (b) 8000 (c) 800 (d) 80000
7. 7.Round 18307 to the nearest ten.
8. 8.Which is closest to 1505 ÷ 51? (a) 300 (b) 60 (c) 15 (d) 30
9. 9.Which is closest to 304 + 597 + 302? (a) 1400 (b) 1100 (c) 1200 (d) 1300
10. 10.Which is closest to 497 × 40? (Round each number first.) (a) 20000 (b) 2000 (c) 200000 (d) 40000
11. 11.Which is closest to 903 × 81? (Round each number first.) (a) 720000 (b) 72000 (c) 7200 (d) 144000
12. 12.Which is closest to 699 + 199 + 902? (a) 1900 (b) 1800 (c) 2000 (d) 1700
13. 13.Round 74063 to the nearest thousand.
14. 14.Which is closest to 401 × 31? (Round each number first.) (a) 1200 (b) 12000 (c) 120000 (d) 24000
15. 15.Which is closest to 399 × 22? (Round each number first.) (a) 800 (b) 8000 (c) 16000 (d) 80000
16. 16.Which is closest to 901 × 59? (Round each number first.) (a) 108000 (b) 5400 (c) 54000 (d) 540000
17. 17.Which is closest to 801 + 405 + 105? (a) 1500 (b) 1200 (c) 1400 (d) 1300
18. 18.Which is closest to 903 × 69? (Round each number first.) (a) 126000 (b) 6300 (c) 63000 (d) 630000
19. 19.Round 91.63 to one decimal place. =
20. 20.Which is closest to 602 × 78? (Round each number first.) (a) 96000 (b) 4800 (c) 480000 (d) 48000
21. 21.Which is closest to 503 + 400 + 595? (a) 1500 (b) 1700 (c) 1400 (d) 1600
22. 22.Round 40.18 to one decimal place. =
23. 23.Which is closest to 597 × 68? (Round each number first.) (a) 84000 (b) 4200 (c) 420000 (d) 42000
24. 24.Which is closest to 391 ÷ 21? (a) 40 (b) 10 (c) 20 (d) 200
25. 25.Round 33726 to the nearest ten.
26. 26.Round 53654 to the nearest ten.
27. 27.Which is closest to 97 + 300 + 103? (a) 700 (b) 600 (c) 400 (d) 500
28. 28.Round 57.13 to one decimal place. =
29. 29.Round 68308 to the nearest ten.
30. 30.Which is closest to 301 × 69? (Round each number first.) (a) 210000 (b) 42000 (c) 21000 (d) 2100
31. 31.Which is closest to 897 × 91? (Round each number first.) (a) 810000 (b) 8100 (c) 162000 (d) 81000
32. 32.Which is closest to 301 × 91? (Round each number first.) (a) 2700 (b) 54000 (c) 270000 (d) 27000
33. 33.Which is closest to 398 × 18? (Round each number first.) (a) 16000 (b) 80000 (c) 800 (d) 8000
34. 34.Which is closest to 95 + 397 + 905? (a) 1500 (b) 1400 (c) 1600 (d) 1300
35. 35.Which is closest to 798 × 72? (Round each number first.) (a) 5600 (b) 560000 (c) 112000 (d) 56000
36. 36.Round 25380 to the nearest hundred.
37. 37.Round 27.06 to one decimal place. =
38. 38.Which is closest to 903 × 30? (Round each number first.) (a) 27000 (b) 270000 (c) 54000 (d) 2700
39. 39.Which is closest to 604 × 59? (Round each number first.) (a) 3600 (b) 360000 (c) 72000 (d) 36000
40. 40.Which is closest to 796 × 82? (Round each number first.) (a) 640000 (b) 6400 (c) 64000 (d) 128000

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