Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 670 · 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 2701 ÷ 31? (a) 180 (b) 900 (c) 90 (d) 45
2. 2.Which is closest to 398 × 82? (Round each number first.) (a) 64000 (b) 32000 (c) 320000 (d) 3200
3. 3.Round 73.61 to one decimal place. =
4. 4.Which is closest to 596 × 39? (Round each number first.) (a) 240000 (b) 48000 (c) 2400 (d) 24000
5. 5.Which is closest to 596 × 82? (Round each number first.) (a) 4800 (b) 48000 (c) 96000 (d) 480000
6. 6.Round 38.52 to one decimal place. =
7. 7.Round 36947 to the nearest thousand.
8. 8.Round 91220 to the nearest hundred.
9. 9.Round 4763 to the nearest ten.
10. 10.Round 66442 to the nearest ten.
11. 11.Round 11240 to the nearest thousand.
12. 12.Which is closest to 498 + 900 + 205? (a) 1800 (b) 1600 (c) 1700 (d) 1500
13. 13.Which is closest to 701 × 79? (Round each number first.) (a) 560000 (b) 5600 (c) 112000 (d) 56000
14. 14.Which is closest to 1396 ÷ 19? (a) 700 (b) 70 (c) 35 (d) 140
15. 15.Which is closest to 904 × 59? (Round each number first.) (a) 108000 (b) 540000 (c) 54000 (d) 5400
16. 16.Which is closest to 699 × 20? (Round each number first.) (a) 28000 (b) 1400 (c) 14000 (d) 140000
17. 17.Which is closest to 396 + 198 + 496? (a) 1100 (b) 1000 (c) 1200 (d) 1300
18. 18.Which is closest to 501 × 40? (Round each number first.) (a) 20000 (b) 200000 (c) 2000 (d) 40000
19. 19.Which is closest to 303 + 99 + 105? (a) 700 (b) 600 (c) 400 (d) 500
20. 20.Which is closest to 496 × 90? (Round each number first.) (a) 45000 (b) 90000 (c) 4500 (d) 450000
21. 21.Which is closest to 899 + 801 + 904? (a) 2800 (b) 2700 (c) 2600 (d) 2500
22. 22.Round 25140 to the nearest thousand.
23. 23.Which is closest to 903 × 48? (Round each number first.) (a) 90000 (b) 45000 (c) 4500 (d) 450000
24. 24.Round 75474 to the nearest ten.
25. 25.Which is closest to 599 × 48? (Round each number first.) (a) 300000 (b) 30000 (c) 60000 (d) 3000
26. 26.Which is closest to 496 + 202 + 697? (a) 1300 (b) 1400 (c) 1500 (d) 1600
27. 27.Which is closest to 1499 ÷ 51? (a) 300 (b) 60 (c) 15 (d) 30
28. 28.Which is closest to 797 + 902 + 299? (a) 2100 (b) 2200 (c) 2000 (d) 1900
29. 29.Which is closest to 197 × 28? (Round each number first.) (a) 12000 (b) 60000 (c) 600 (d) 6000
30. 30.Round 46.37 to one decimal place. =
31. 31.Round 55.11 to one decimal place. =
32. 32.Which is closest to 797 × 61? (Round each number first.) (a) 96000 (b) 4800 (c) 480000 (d) 48000
33. 33.Which is closest to 1406 ÷ 21? (a) 140 (b) 35 (c) 700 (d) 70
34. 34.Which is closest to 396 + 597 + 96? (a) 1000 (b) 1300 (c) 1100 (d) 1200
35. 35.Which is closest to 1001 ÷ 19? (a) 50 (b) 25 (c) 100 (d) 500
36. 36.Which is closest to 103 + 197 + 99? (a) 600 (b) 400 (c) 500 (d) 300
37. 37.Round 31584 to the nearest ten.
38. 38.Which is closest to 500 × 32? (Round each number first.) (a) 150000 (b) 1500 (c) 15000 (d) 30000
39. 39.Which is closest to 600 × 52? (Round each number first.) (a) 300000 (b) 60000 (c) 30000 (d) 3000
40. 40.Which is closest to 698 × 88? (Round each number first.) (a) 126000 (b) 6300 (c) 630000 (d) 63000

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