Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 490 · 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 1205 ÷ 29? (a) 40 (b) 400 (c) 80 (d) 20
2. 2.Which is closest to 599 × 81? (Round each number first.) (a) 480000 (b) 96000 (c) 4800 (d) 48000
3. 3.Which is closest to 2106 ÷ 31? (a) 140 (b) 70 (c) 35 (d) 700
4. 4.Which is closest to 497 × 48? (Round each number first.) (a) 250000 (b) 50000 (c) 2500 (d) 25000
5. 5.Which is closest to 302 × 28? (Round each number first.) (a) 90000 (b) 900 (c) 18000 (d) 9000
6. 6.Which is closest to 496 × 61? (Round each number first.) (a) 60000 (b) 30000 (c) 3000 (d) 300000
7. 7.Which is closest to 599 × 21? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
8. 8.Which is closest to 398 × 79? (Round each number first.) (a) 32000 (b) 320000 (c) 3200 (d) 64000
9. 9.Which is closest to 198 × 81? (Round each number first.) (a) 16000 (b) 32000 (c) 160000 (d) 1600
10. 10.Which is closest to 95 + 903 + 799? (a) 2000 (b) 1700 (c) 1900 (d) 1800
11. 11.Round 7698 to the nearest ten.
12. 12.Which is closest to 499 × 60? (Round each number first.) (a) 3000 (b) 60000 (c) 300000 (d) 30000
13. 13.Round 70.73 to one decimal place. =
14. 14.Which is closest to 902 × 52? (Round each number first.) (a) 4500 (b) 450000 (c) 45000 (d) 90000
15. 15.Round 17.09 to one decimal place. =
16. 16.Which is closest to 896 + 499 + 605? (a) 2000 (b) 1900 (c) 2200 (d) 2100
17. 17.Which is closest to 698 + 595 + 497? (a) 1700 (b) 1800 (c) 2000 (d) 1900
18. 18.Round 21246 to the nearest ten.
19. 19.Round 19641 to the nearest ten.
20. 20.Which is closest to 605 + 903 + 695? (a) 2100 (b) 2300 (c) 2200 (d) 2400
21. 21.Round 60.88 to one decimal place. =
22. 22.Which is closest to 197 + 404 + 598? (a) 1400 (b) 1200 (c) 1100 (d) 1300
23. 23.Round 25168 to the nearest ten.
24. 24.Which is closest to 702 × 29? (Round each number first.) (a) 2100 (b) 21000 (c) 42000 (d) 210000
25. 25.Round 38288 to the nearest thousand.
26. 26.Which is closest to 602 × 62? (Round each number first.) (a) 72000 (b) 360000 (c) 36000 (d) 3600
27. 27.Round 71.51 to one decimal place. =
28. 28.Which is closest to 602 × 20? (Round each number first.) (a) 12000 (b) 1200 (c) 24000 (d) 120000
29. 29.Round 58128 to the nearest hundred.
30. 30.Round 65829 to the nearest thousand.
31. 31.Round 93.78 to one decimal place. =
32. 32.Which is closest to 900 × 49? (Round each number first.) (a) 450000 (b) 90000 (c) 4500 (d) 45000
33. 33.Round 87.49 to one decimal place. =
34. 34.Which is closest to 304 + 601 + 600? (a) 1400 (b) 1500 (c) 1600 (d) 1700
35. 35.Which is closest to 1599 ÷ 19? (a) 800 (b) 160 (c) 80 (d) 40
36. 36.Which is closest to 399 × 60? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
37. 37.Round 3085 to the nearest hundred.
38. 38.Which is closest to 808 ÷ 19? (a) 400 (b) 80 (c) 20 (d) 40
39. 39.Which is closest to 1202 ÷ 29? (a) 400 (b) 80 (c) 20 (d) 40
40. 40.Which is closest to 398 × 92? (Round each number first.) (a) 360000 (b) 3600 (c) 36000 (d) 72000

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