Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 904 · 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 501 + 396 + 297? (a) 1200 (b) 1100 (c) 1300 (d) 1400
2. 2.Which is closest to 96 + 499 + 405? (a) 1200 (b) 900 (c) 1000 (d) 1100
3. 3.Which is closest to 298 × 38? (Round each number first.) (a) 24000 (b) 120000 (c) 1200 (d) 12000
4. 4.Which is closest to 298 × 82? (Round each number first.) (a) 48000 (b) 2400 (c) 240000 (d) 24000
5. 5.Which is closest to 599 + 595 + 400? (a) 1800 (b) 1600 (c) 1500 (d) 1700
6. 6.Round 40.74 to one decimal place. =
7. 7.Which is closest to 302 × 68? (Round each number first.) (a) 2100 (b) 21000 (c) 42000 (d) 210000
8. 8.Which is closest to 397 × 92? (Round each number first.) (a) 72000 (b) 360000 (c) 3600 (d) 36000
9. 9.Round 97.79 to one decimal place. =
10. 10.Round 31890 to the nearest thousand.
11. 11.Round 14.81 to one decimal place. =
12. 12.Round 78.53 to one decimal place. =
13. 13.Which is closest to 197 × 42? (Round each number first.) (a) 800 (b) 8000 (c) 16000 (d) 80000
14. 14.Which is closest to 2798 ÷ 39? (a) 35 (b) 70 (c) 140 (d) 700
15. 15.Which is closest to 95 + 105 + 298? (a) 600 (b) 500 (c) 400 (d) 700
16. 16.Round 68.59 to one decimal place. =
17. 17.Which is closest to 402 × 40? (Round each number first.) (a) 16000 (b) 1600 (c) 160000 (d) 32000
18. 18.Round 49.54 to one decimal place. =
19. 19.Which is closest to 202 × 51? (Round each number first.) (a) 100000 (b) 1000 (c) 20000 (d) 10000
20. 20.Round 79278 to the nearest hundred.
21. 21.Which is closest to 100 + 903 + 99? (a) 1200 (b) 1000 (c) 1300 (d) 1100
22. 22.Round 91447 to the nearest thousand.
23. 23.Which is closest to 403 × 20? (Round each number first.) (a) 800 (b) 16000 (c) 80000 (d) 8000
24. 24.Round 40636 to the nearest thousand.
25. 25.Which is closest to 398 + 96 + 695? (a) 1200 (b) 1300 (c) 1400 (d) 1100
26. 26.Which is closest to 3999 ÷ 49? (a) 80 (b) 160 (c) 40 (d) 800
27. 27.Round 27672 to the nearest ten.
28. 28.Which is closest to 599 × 80? (Round each number first.) (a) 4800 (b) 96000 (c) 480000 (d) 48000
29. 29.Which is closest to 502 × 29? (Round each number first.) (a) 150000 (b) 30000 (c) 15000 (d) 1500
30. 30.Which is closest to 1506 ÷ 49? (a) 60 (b) 300 (c) 15 (d) 30
31. 31.Which is closest to 897 × 20? (Round each number first.) (a) 180000 (b) 18000 (c) 1800 (d) 36000
32. 32.Round 82694 to the nearest thousand.
33. 33.Which is closest to 198 × 68? (Round each number first.) (a) 1400 (b) 28000 (c) 14000 (d) 140000
34. 34.Round 77900 to the nearest thousand.
35. 35.Which is closest to 98 + 797 + 402? (a) 1200 (b) 1500 (c) 1300 (d) 1400
36. 36.Which is closest to 202 × 69? (Round each number first.) (a) 1400 (b) 28000 (c) 14000 (d) 140000
37. 37.Which is closest to 96 + 96 + 296? (a) 600 (b) 400 (c) 500 (d) 700
38. 38.Which is closest to 498 × 68? (Round each number first.) (a) 35000 (b) 3500 (c) 70000 (d) 350000
39. 39.Round 94.17 to one decimal place. =
40. 40.Which is closest to 903 × 81? (Round each number first.) (a) 720000 (b) 7200 (c) 72000 (d) 144000

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