Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 579 · 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 5501 to the nearest ten.
2. 2.Round 77.93 to one decimal place. =
3. 3.Round 98.57 to one decimal place. =
4. 4.Round 54.18 to one decimal place. =
5. 5.Which is closest to 499 × 79? (Round each number first.) (a) 400000 (b) 4000 (c) 80000 (d) 40000
6. 6.Which is closest to 1006 ÷ 19? (a) 100 (b) 50 (c) 500 (d) 25
7. 7.Which is closest to 496 × 59? (Round each number first.) (a) 3000 (b) 30000 (c) 300000 (d) 60000
8. 8.Which is closest to 703 × 82? (Round each number first.) (a) 560000 (b) 112000 (c) 5600 (d) 56000
9. 9.Round 38.59 to one decimal place. =
10. 10.Which is closest to 2994 ÷ 49? (a) 600 (b) 30 (c) 60 (d) 120
11. 11.Round 18.93 to one decimal place. =
12. 12.Which is closest to 802 + 305 + 803? (a) 2000 (b) 1800 (c) 2100 (d) 1900
13. 13.Round 21457 to the nearest thousand.
14. 14.Which is closest to 504 × 31? (Round each number first.) (a) 150000 (b) 1500 (c) 30000 (d) 15000
15. 15.Which is closest to 296 + 196 + 496? (a) 1000 (b) 1200 (c) 1100 (d) 900
16. 16.Which is closest to 596 × 42? (Round each number first.) (a) 24000 (b) 2400 (c) 240000 (d) 48000
17. 17.Round 23472 to the nearest thousand.
18. 18.Which is closest to 601 × 90? (Round each number first.) (a) 54000 (b) 108000 (c) 540000 (d) 5400
19. 19.Which is closest to 497 × 38? (Round each number first.) (a) 2000 (b) 20000 (c) 200000 (d) 40000
20. 20.Which is closest to 404 + 502 + 205? (a) 1000 (b) 1300 (c) 1200 (d) 1100
21. 21.Which is closest to 900 × 82? (Round each number first.) (a) 7200 (b) 720000 (c) 72000 (d) 144000
22. 22.Round 83756 to the nearest thousand.
23. 23.Which is closest to 1509 ÷ 51? (a) 30 (b) 300 (c) 60 (d) 15
24. 24.Which is closest to 2696 ÷ 29? (a) 180 (b) 900 (c) 45 (d) 90
25. 25.Which is closest to 202 × 42? (Round each number first.) (a) 8000 (b) 800 (c) 80000 (d) 16000
26. 26.Which is closest to 799 × 19? (Round each number first.) (a) 32000 (b) 16000 (c) 1600 (d) 160000
27. 27.Which is closest to 298 × 61? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
28. 28.Which is closest to 300 × 32? (Round each number first.) (a) 90000 (b) 9000 (c) 18000 (d) 900
29. 29.Round 42.16 to one decimal place. =
30. 30.Which is closest to 701 × 41? (Round each number first.) (a) 280000 (b) 2800 (c) 56000 (d) 28000
31. 31.Round 65.46 to one decimal place. =
32. 32.Which is closest to 904 + 697 + 903? (a) 2400 (b) 2700 (c) 2500 (d) 2600
33. 33.Round 53.08 to one decimal place. =
34. 34.Round 32.46 to one decimal place. =
35. 35.Which is closest to 498 × 88? (Round each number first.) (a) 4500 (b) 90000 (c) 45000 (d) 450000
36. 36.Which is closest to 403 × 29? (Round each number first.) (a) 12000 (b) 120000 (c) 1200 (d) 24000
37. 37.Round 89658 to the nearest hundred.
38. 38.Which is closest to 802 × 90? (Round each number first.) (a) 720000 (b) 144000 (c) 7200 (d) 72000
39. 39.Round 44.28 to one decimal place. =
40. 40.Round 84.81 to one decimal place. =

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