Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 321 · 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 303 × 28? (Round each number first.) (a) 9000 (b) 18000 (c) 900 (d) 90000
2. 2.Which is closest to 702 + 896 + 104? (a) 1800 (b) 1700 (c) 1600 (d) 1900
3. 3.Which is closest to 1191 ÷ 31? (a) 400 (b) 20 (c) 40 (d) 80
4. 4.Round 54894 to the nearest ten.
5. 5.Which is closest to 500 × 19? (Round each number first.) (a) 1000 (b) 100000 (c) 20000 (d) 10000
6. 6.Round 97.38 to one decimal place. =
7. 7.Which is closest to 1996 ÷ 41? (a) 500 (b) 50 (c) 25 (d) 100
8. 8.Which is closest to 1507 ÷ 49? (a) 30 (b) 60 (c) 15 (d) 300
9. 9.Which is closest to 503 × 70? (Round each number first.) (a) 350000 (b) 70000 (c) 35000 (d) 3500
10. 10.Round 11.14 to one decimal place. =
11. 11.Which is closest to 102 + 796 + 603? (a) 1600 (b) 1700 (c) 1500 (d) 1400
12. 12.Which is closest to 604 × 79? (Round each number first.) (a) 4800 (b) 96000 (c) 48000 (d) 480000
13. 13.Which is closest to 201 × 92? (Round each number first.) (a) 1800 (b) 36000 (c) 18000 (d) 180000
14. 14.Which is closest to 397 × 90? (Round each number first.) (a) 36000 (b) 3600 (c) 72000 (d) 360000
15. 15.Which is closest to 697 × 38? (Round each number first.) (a) 2800 (b) 56000 (c) 280000 (d) 28000
16. 16.Round 52.41 to one decimal place. =
17. 17.Which is closest to 798 + 395 + 299? (a) 1500 (b) 1600 (c) 1700 (d) 1400
18. 18.Which is closest to 405 ÷ 19? (a) 40 (b) 200 (c) 10 (d) 20
19. 19.Which is closest to 603 × 22? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
20. 20.Which is closest to 503 × 72? (Round each number first.) (a) 70000 (b) 35000 (c) 3500 (d) 350000
21. 21.Round 20.86 to one decimal place. =
22. 22.Round 53790 to the nearest thousand.
23. 23.Which is closest to 2705 ÷ 29? (a) 900 (b) 45 (c) 90 (d) 180
24. 24.Which is closest to 599 ÷ 21? (a) 60 (b) 300 (c) 15 (d) 30
25. 25.Which is closest to 699 × 29? (Round each number first.) (a) 21000 (b) 42000 (c) 2100 (d) 210000
26. 26.Which is closest to 804 × 92? (Round each number first.) (a) 144000 (b) 7200 (c) 720000 (d) 72000
27. 27.Which is closest to 296 + 900 + 798? (a) 2200 (b) 1900 (c) 2100 (d) 2000
28. 28.Which is closest to 907 ÷ 29? (a) 60 (b) 30 (c) 15 (d) 300
29. 29.Which is closest to 496 + 496 + 902? (a) 1900 (b) 2000 (c) 1800 (d) 2100
30. 30.Round 50137 to the nearest thousand.
31. 31.Round 91552 to the nearest thousand.
32. 32.Round 72372 to the nearest ten.
33. 33.Which is closest to 498 × 49? (Round each number first.) (a) 250000 (b) 2500 (c) 50000 (d) 25000
34. 34.Round 85.06 to one decimal place. =
35. 35.Round 39286 to the nearest thousand.
36. 36.Which is closest to 2797 ÷ 41? (a) 70 (b) 140 (c) 700 (d) 35
37. 37.Which is closest to 500 × 28? (Round each number first.) (a) 150000 (b) 1500 (c) 15000 (d) 30000
38. 38.Which is closest to 905 + 102 + 600? (a) 1700 (b) 1800 (c) 1600 (d) 1500
39. 39.Which is closest to 1204 ÷ 41? (a) 300 (b) 60 (c) 30 (d) 15
40. 40.Which is closest to 698 × 49? (Round each number first.) (a) 350000 (b) 3500 (c) 35000 (d) 70000

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