Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 130 · 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 17.91 to one decimal place. =
2. 2.Round 12.17 to one decimal place. =
3. 3.Which is closest to 799 × 78? (Round each number first.) (a) 640000 (b) 64000 (c) 128000 (d) 6400
4. 4.Round 20.51 to one decimal place. =
5. 5.Which is closest to 204 + 298 + 799? (a) 1500 (b) 1200 (c) 1400 (d) 1300
6. 6.Which is closest to 397 × 61? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
7. 7.Round 23243 to the nearest ten.
8. 8.Round 33688 to the nearest hundred.
9. 9.Which is closest to 2700 ÷ 29? (a) 45 (b) 180 (c) 900 (d) 90
10. 10.Which is closest to 297 + 702 + 698? (a) 1800 (b) 1700 (c) 1600 (d) 1900
11. 11.Round 66630 to the nearest thousand.
12. 12.Which is closest to 802 ÷ 19? (a) 400 (b) 40 (c) 80 (d) 20
13. 13.Which is closest to 902 × 20? (Round each number first.) (a) 18000 (b) 180000 (c) 1800 (d) 36000
14. 14.Which is closest to 808 ÷ 41? (a) 10 (b) 200 (c) 40 (d) 20
15. 15.Round 2117 to the nearest thousand.
16. 16.Which is closest to 600 ÷ 19? (a) 60 (b) 30 (c) 15 (d) 300
17. 17.Which is closest to 200 + 705 + 204? (a) 1000 (b) 1200 (c) 1100 (d) 1300
18. 18.Which is closest to 395 + 704 + 300? (a) 1400 (b) 1300 (c) 1500 (d) 1600
19. 19.Which is closest to 703 × 69? (Round each number first.) (a) 4900 (b) 98000 (c) 49000 (d) 490000
20. 20.Which is closest to 403 × 89? (Round each number first.) (a) 3600 (b) 360000 (c) 72000 (d) 36000
21. 21.Which is closest to 605 + 201 + 97? (a) 1100 (b) 800 (c) 900 (d) 1000
22. 22.Which is closest to 904 × 40? (Round each number first.) (a) 3600 (b) 72000 (c) 360000 (d) 36000
23. 23.Round 33.94 to one decimal place. =
24. 24.Which is closest to 595 + 500 + 501? (a) 1600 (b) 1500 (c) 1800 (d) 1700
25. 25.Which is closest to 2791 ÷ 39? (a) 140 (b) 35 (c) 700 (d) 70
26. 26.Which is closest to 598 × 71? (Round each number first.) (a) 420000 (b) 4200 (c) 42000 (d) 84000
27. 27.Which is closest to 798 × 32? (Round each number first.) (a) 2400 (b) 48000 (c) 24000 (d) 240000
28. 28.Which is closest to 497 × 50? (Round each number first.) (a) 50000 (b) 250000 (c) 25000 (d) 2500
29. 29.Which is closest to 504 × 31? (Round each number first.) (a) 30000 (b) 150000 (c) 15000 (d) 1500
30. 30.Which is closest to 600 × 21? (Round each number first.) (a) 12000 (b) 24000 (c) 120000 (d) 1200
31. 31.Round 14272 to the nearest hundred.
32. 32.Which is closest to 3592 ÷ 39? (a) 900 (b) 45 (c) 180 (d) 90
33. 33.Which is closest to 603 × 92? (Round each number first.) (a) 108000 (b) 540000 (c) 54000 (d) 5400
34. 34.Which is closest to 405 + 495 + 903? (a) 1800 (b) 1700 (c) 2000 (d) 1900
35. 35.Which is closest to 399 × 28? (Round each number first.) (a) 1200 (b) 24000 (c) 120000 (d) 12000
36. 36.Which is closest to 1197 ÷ 41? (a) 60 (b) 30 (c) 300 (d) 15
37. 37.Round 67777 to the nearest thousand.
38. 38.Which is closest to 196 × 40? (Round each number first.) (a) 16000 (b) 80000 (c) 8000 (d) 800
39. 39.Which is closest to 797 ÷ 21? (a) 20 (b) 40 (c) 80 (d) 400
40. 40.Round 15.46 to one decimal place. =

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