Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 242 · 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 903 + 698 + 104? (a) 1800 (b) 1900 (c) 1600 (d) 1700
2. 2.Round 45411 to the nearest ten.
3. 3.Round 87174 to the nearest thousand.
4. 4.Which is closest to 3007 ÷ 51? (a) 120 (b) 60 (c) 600 (d) 30
5. 5.Which is closest to 500 × 29? (Round each number first.) (a) 30000 (b) 150000 (c) 1500 (d) 15000
6. 6.Which is closest to 397 × 48? (Round each number first.) (a) 20000 (b) 40000 (c) 200000 (d) 2000
7. 7.Which is closest to 296 × 78? (Round each number first.) (a) 240000 (b) 2400 (c) 24000 (d) 48000
8. 8.Which is closest to 2393 ÷ 39? (a) 120 (b) 60 (c) 600 (d) 30
9. 9.Round 32.18 to one decimal place. =
10. 10.Which is closest to 200 × 51? (Round each number first.) (a) 100000 (b) 10000 (c) 20000 (d) 1000
11. 11.Which is closest to 900 × 38? (Round each number first.) (a) 360000 (b) 3600 (c) 36000 (d) 72000
12. 12.Which is closest to 898 + 698 + 602? (a) 2100 (b) 2200 (c) 2400 (d) 2300
13. 13.Which is closest to 496 × 70? (Round each number first.) (a) 3500 (b) 70000 (c) 35000 (d) 350000
14. 14.Which is closest to 2692 ÷ 29? (a) 45 (b) 900 (c) 180 (d) 90
15. 15.Round 24.19 to one decimal place. =
16. 16.Round 22.42 to one decimal place. =
17. 17.Which is closest to 202 + 498 + 596? (a) 1500 (b) 1200 (c) 1300 (d) 1400
18. 18.Round 68.82 to one decimal place. =
19. 19.Which is closest to 404 × 61? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
20. 20.Which is closest to 2798 ÷ 41? (a) 140 (b) 70 (c) 700 (d) 35
21. 21.Which is closest to 499 × 18? (Round each number first.) (a) 100000 (b) 1000 (c) 20000 (d) 10000
22. 22.Which is closest to 796 × 81? (Round each number first.) (a) 640000 (b) 6400 (c) 64000 (d) 128000
23. 23.Which is closest to 900 × 28? (Round each number first.) (a) 2700 (b) 270000 (c) 27000 (d) 54000
24. 24.Which is closest to 2394 ÷ 29? (a) 40 (b) 80 (c) 800 (d) 160
25. 25.Which is closest to 3000 ÷ 51? (a) 30 (b) 600 (c) 60 (d) 120
26. 26.Which is closest to 295 + 296 + 698? (a) 1400 (b) 1200 (c) 1300 (d) 1500
27. 27.Round 56.12 to one decimal place. =
28. 28.Which is closest to 299 × 50? (Round each number first.) (a) 15000 (b) 30000 (c) 1500 (d) 150000
29. 29.Which is closest to 698 × 89? (Round each number first.) (a) 6300 (b) 63000 (c) 630000 (d) 126000
30. 30.Which is closest to 702 × 21? (Round each number first.) (a) 140000 (b) 28000 (c) 1400 (d) 14000
31. 31.Round 81714 to the nearest hundred.
32. 32.Which is closest to 2792 ÷ 41? (a) 70 (b) 700 (c) 140 (d) 35
33. 33.Which is closest to 1596 ÷ 19? (a) 800 (b) 40 (c) 80 (d) 160
34. 34.Which is closest to 1199 ÷ 39? (a) 300 (b) 30 (c) 15 (d) 60
35. 35.Which is closest to 296 × 19? (Round each number first.) (a) 60000 (b) 600 (c) 12000 (d) 6000
36. 36.Round 13899 to the nearest ten.
37. 37.Which is closest to 502 + 602 + 203? (a) 1400 (b) 1200 (c) 1300 (d) 1500
38. 38.Round 17.54 to one decimal place. =
39. 39.Which is closest to 909 ÷ 29? (a) 15 (b) 300 (c) 30 (d) 60
40. 40.Which is closest to 500 × 82? (Round each number first.) (a) 40000 (b) 80000 (c) 400000 (d) 4000

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