Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 653 · 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 797 × 30? (Round each number first.) (a) 48000 (b) 24000 (c) 2400 (d) 240000
2. 2.Which is closest to 204 + 901 + 102? (a) 1400 (b) 1100 (c) 1300 (d) 1200
3. 3.Which is closest to 503 × 82? (Round each number first.) (a) 4000 (b) 80000 (c) 40000 (d) 400000
4. 4.Which is closest to 803 × 89? (Round each number first.) (a) 144000 (b) 7200 (c) 720000 (d) 72000
5. 5.Which is closest to 602 + 896 + 495? (a) 2100 (b) 2200 (c) 2000 (d) 1900
6. 6.Which is closest to 1201 ÷ 31? (a) 80 (b) 400 (c) 40 (d) 20
7. 7.Round 84590 to the nearest hundred.
8. 8.Round 89.63 to one decimal place. =
9. 9.Which is closest to 404 × 78? (Round each number first.) (a) 3200 (b) 64000 (c) 320000 (d) 32000
10. 10.Which is closest to 801 ÷ 21? (a) 20 (b) 80 (c) 40 (d) 400
11. 11.Which is closest to 298 + 400 + 196? (a) 900 (b) 1000 (c) 800 (d) 1100
12. 12.Which is closest to 797 × 89? (Round each number first.) (a) 720000 (b) 7200 (c) 144000 (d) 72000
13. 13.Round 55527 to the nearest ten.
14. 14.Which is closest to 696 × 62? (Round each number first.) (a) 42000 (b) 4200 (c) 84000 (d) 420000
15. 15.Which is closest to 702 + 498 + 101? (a) 1500 (b) 1300 (c) 1400 (d) 1200
16. 16.Which is closest to 604 × 71? (Round each number first.) (a) 42000 (b) 4200 (c) 420000 (d) 84000
17. 17.Round 40.86 to one decimal place. =
18. 18.Which is closest to 497 + 101 + 704? (a) 1400 (b) 1300 (c) 1500 (d) 1200
19. 19.Which is closest to 3598 ÷ 41? (a) 900 (b) 90 (c) 180 (d) 45
20. 20.Which is closest to 2101 ÷ 31? (a) 70 (b) 140 (c) 35 (d) 700
21. 21.Which is closest to 502 × 90? (Round each number first.) (a) 45000 (b) 450000 (c) 4500 (d) 90000
22. 22.Which is closest to 699 + 603 + 704? (a) 1900 (b) 2200 (c) 2100 (d) 2000
23. 23.Round 18007 to the nearest hundred.
24. 24.Round 28.38 to one decimal place. =
25. 25.Which is closest to 298 × 19? (Round each number first.) (a) 12000 (b) 6000 (c) 60000 (d) 600
26. 26.Which is closest to 497 × 79? (Round each number first.) (a) 80000 (b) 4000 (c) 40000 (d) 400000
27. 27.Which is closest to 802 × 41? (Round each number first.) (a) 320000 (b) 32000 (c) 64000 (d) 3200
28. 28.Round 21.13 to one decimal place. =
29. 29.Which is closest to 2799 ÷ 41? (a) 140 (b) 35 (c) 70 (d) 700
30. 30.Which is closest to 496 × 18? (Round each number first.) (a) 1000 (b) 20000 (c) 10000 (d) 100000
31. 31.Which is closest to 1993 ÷ 39? (a) 500 (b) 25 (c) 100 (d) 50
32. 32.Which is closest to 595 + 797 + 697? (a) 2300 (b) 2200 (c) 2000 (d) 2100
33. 33.Round 11.36 to one decimal place. =
34. 34.Round 44.68 to one decimal place. =
35. 35.Which is closest to 299 + 600 + 599? (a) 1500 (b) 1600 (c) 1700 (d) 1400
36. 36.Which is closest to 404 × 32? (Round each number first.) (a) 12000 (b) 120000 (c) 24000 (d) 1200
37. 37.Round 86.43 to one decimal place. =
38. 38.Round 71718 to the nearest hundred.
39. 39.Which is closest to 2397 ÷ 29? (a) 80 (b) 160 (c) 800 (d) 40
40. 40.Which is closest to 495 + 795 + 801? (a) 2200 (b) 2000 (c) 2100 (d) 2300

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