Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 78 · 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 94.91 to one decimal place. =
2. 2.Round 42107 to the nearest ten.
3. 3.Round 51.26 to one decimal place. =
4. 4.Round 59.93 to one decimal place. =
5. 5.Which is closest to 498 + 97 + 495? (a) 1200 (b) 1300 (c) 1100 (d) 1000
6. 6.Round 43846 to the nearest hundred.
7. 7.Round 47.39 to one decimal place. =
8. 8.Which is closest to 305 + 405 + 300? (a) 900 (b) 1000 (c) 1200 (d) 1100
9. 9.Which is closest to 796 × 22? (Round each number first.) (a) 160000 (b) 16000 (c) 1600 (d) 32000
10. 10.Which is closest to 1192 ÷ 39? (a) 15 (b) 300 (c) 60 (d) 30
11. 11.Round 45.38 to one decimal place. =
12. 12.Round 10.56 to one decimal place. =
13. 13.Round 3215 to the nearest thousand.
14. 14.Which is closest to 696 × 59? (Round each number first.) (a) 4200 (b) 42000 (c) 420000 (d) 84000
15. 15.Which is closest to 496 × 28? (Round each number first.) (a) 1500 (b) 150000 (c) 15000 (d) 30000
16. 16.Which is closest to 2006 ÷ 51? (a) 40 (b) 80 (c) 400 (d) 20
17. 17.Which is closest to 304 + 97 + 201? (a) 700 (b) 800 (c) 500 (d) 600
18. 18.Which is closest to 699 × 52? (Round each number first.) (a) 70000 (b) 350000 (c) 35000 (d) 3500
19. 19.Round 93.89 to one decimal place. =
20. 20.Round 33.63 to one decimal place. =
21. 21.Which is closest to 703 × 41? (Round each number first.) (a) 2800 (b) 56000 (c) 280000 (d) 28000
22. 22.Which is closest to 798 × 41? (Round each number first.) (a) 3200 (b) 32000 (c) 64000 (d) 320000
23. 23.Which is closest to 604 × 22? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
24. 24.Which is closest to 95 + 102 + 301? (a) 400 (b) 600 (c) 500 (d) 700
25. 25.Round 10744 to the nearest hundred.
26. 26.Which is closest to 900 + 502 + 599? (a) 2100 (b) 2200 (c) 2000 (d) 1900
27. 27.Round 25057 to the nearest thousand.
28. 28.Which is closest to 696 + 298 + 402? (a) 1400 (b) 1500 (c) 1600 (d) 1300
29. 29.Which is closest to 800 + 101 + 98? (a) 1200 (b) 900 (c) 1100 (d) 1000
30. 30.Which is closest to 700 × 78? (Round each number first.) (a) 112000 (b) 560000 (c) 5600 (d) 56000
31. 31.Which is closest to 301 × 18? (Round each number first.) (a) 6000 (b) 60000 (c) 600 (d) 12000
32. 32.Round 82.12 to one decimal place. =
33. 33.Which is closest to 504 × 29? (Round each number first.) (a) 15000 (b) 1500 (c) 30000 (d) 150000
34. 34.Which is closest to 1391 ÷ 21? (a) 70 (b) 700 (c) 140 (d) 35
35. 35.Which is closest to 802 × 59? (Round each number first.) (a) 48000 (b) 96000 (c) 4800 (d) 480000
36. 36.Round 31327 to the nearest thousand.
37. 37.Which is closest to 97 + 900 + 599? (a) 1500 (b) 1800 (c) 1600 (d) 1700
38. 38.Which is closest to 798 × 71? (Round each number first.) (a) 56000 (b) 560000 (c) 112000 (d) 5600
39. 39.Round 52796 to the nearest ten.
40. 40.Which is closest to 804 × 80? (Round each number first.) (a) 6400 (b) 640000 (c) 128000 (d) 64000

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