Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 987 · 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 902 × 70? (Round each number first.) (a) 630000 (b) 6300 (c) 126000 (d) 63000
2. 2.Which is closest to 797 ÷ 21? (a) 20 (b) 40 (c) 80 (d) 400
3. 3.Which is closest to 205 + 802 + 95? (a) 1200 (b) 1300 (c) 1000 (d) 1100
4. 4.Which is closest to 704 × 29? (Round each number first.) (a) 42000 (b) 21000 (c) 210000 (d) 2100
5. 5.Which is closest to 403 × 89? (Round each number first.) (a) 360000 (b) 72000 (c) 3600 (d) 36000
6. 6.Which is closest to 3508 ÷ 51? (a) 700 (b) 140 (c) 70 (d) 35
7. 7.Which is closest to 501 + 501 + 303? (a) 1500 (b) 1200 (c) 1300 (d) 1400
8. 8.Round 14.18 to one decimal place. =
9. 9.Which is closest to 396 × 48? (Round each number first.) (a) 2000 (b) 200000 (c) 40000 (d) 20000
10. 10.Round 16.07 to one decimal place. =
11. 11.Round 14.47 to one decimal place. =
12. 12.Which is closest to 1604 ÷ 21? (a) 40 (b) 160 (c) 80 (d) 800
13. 13.Which is closest to 4492 ÷ 51? (a) 90 (b) 180 (c) 900 (d) 45
14. 14.Round 95.89 to one decimal place. =
15. 15.Which is closest to 796 × 70? (Round each number first.) (a) 5600 (b) 560000 (c) 112000 (d) 56000
16. 16.Round 11.22 to one decimal place. =
17. 17.Round 99.26 to one decimal place. =
18. 18.Which is closest to 898 × 58? (Round each number first.) (a) 108000 (b) 5400 (c) 540000 (d) 54000
19. 19.Which is closest to 401 × 38? (Round each number first.) (a) 1600 (b) 32000 (c) 160000 (d) 16000
20. 20.Round 39.32 to one decimal place. =
21. 21.Which is closest to 405 ÷ 19? (a) 200 (b) 40 (c) 10 (d) 20
22. 22.Which is closest to 1199 ÷ 19? (a) 600 (b) 120 (c) 30 (d) 60
23. 23.Which is closest to 3205 ÷ 39? (a) 40 (b) 160 (c) 80 (d) 800
24. 24.Which is closest to 900 × 71? (Round each number first.) (a) 6300 (b) 63000 (c) 126000 (d) 630000
25. 25.Round 29.12 to one decimal place. =
26. 26.Which is closest to 598 × 52? (Round each number first.) (a) 300000 (b) 3000 (c) 60000 (d) 30000
27. 27.Which is closest to 403 × 18? (Round each number first.) (a) 16000 (b) 8000 (c) 800 (d) 80000
28. 28.Which is closest to 804 + 597 + 202? (a) 1800 (b) 1600 (c) 1700 (d) 1500
29. 29.Which is closest to 1504 ÷ 29? (a) 100 (b) 25 (c) 50 (d) 500
30. 30.Which is closest to 702 × 82? (Round each number first.) (a) 5600 (b) 56000 (c) 112000 (d) 560000
31. 31.Which is closest to 304 × 81? (Round each number first.) (a) 240000 (b) 48000 (c) 2400 (d) 24000
32. 32.Round 91168 to the nearest ten.
33. 33.Which is closest to 2409 ÷ 41? (a) 600 (b) 60 (c) 120 (d) 30
34. 34.Which is closest to 804 × 58? (Round each number first.) (a) 48000 (b) 480000 (c) 4800 (d) 96000
35. 35.Round 99101 to the nearest ten.
36. 36.Which is closest to 802 × 40? (Round each number first.) (a) 3200 (b) 320000 (c) 32000 (d) 64000
37. 37.Which is closest to 95 + 298 + 299? (a) 600 (b) 800 (c) 700 (d) 900
38. 38.Which is closest to 600 + 98 + 598? (a) 1200 (b) 1300 (c) 1400 (d) 1500
39. 39.Which is closest to 701 × 69? (Round each number first.) (a) 49000 (b) 4900 (c) 490000 (d) 98000
40. 40.Which is closest to 302 × 21? (Round each number first.) (a) 6000 (b) 60000 (c) 12000 (d) 600

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