Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 501 · 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 399 × 49? (Round each number first.) (a) 200000 (b) 20000 (c) 2000 (d) 40000
2. 2.Round 14401 to the nearest thousand.
3. 3.Which is closest to 404 ÷ 21? (a) 200 (b) 40 (c) 20 (d) 10
4. 4.Round 44.42 to one decimal place. =
5. 5.Round 70.74 to one decimal place. =
6. 6.Round 14.66 to one decimal place. =
7. 7.Which is closest to 204 + 796 + 605? (a) 1700 (b) 1600 (c) 1800 (d) 1500
8. 8.Which is closest to 402 × 48? (Round each number first.) (a) 2000 (b) 40000 (c) 200000 (d) 20000
9. 9.Which is closest to 604 × 19? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
10. 10.Which is closest to 502 × 52? (Round each number first.) (a) 250000 (b) 50000 (c) 2500 (d) 25000
11. 11.Which is closest to 204 × 61? (Round each number first.) (a) 24000 (b) 120000 (c) 1200 (d) 12000
12. 12.Which is closest to 902 × 39? (Round each number first.) (a) 3600 (b) 360000 (c) 36000 (d) 72000
13. 13.Round 58.36 to one decimal place. =
14. 14.Round 15.18 to one decimal place. =
15. 15.Round 60741 to the nearest hundred.
16. 16.Round 45843 to the nearest hundred.
17. 17.Which is closest to 97 + 703 + 96? (a) 1100 (b) 900 (c) 800 (d) 1000
18. 18.Round 32934 to the nearest hundred.
19. 19.Which is closest to 598 + 200 + 901? (a) 1900 (b) 1600 (c) 1700 (d) 1800
20. 20.Round 90019 to the nearest hundred.
21. 21.Round 51326 to the nearest ten.
22. 22.Round 60.44 to one decimal place. =
23. 23.Round 58.29 to one decimal place. =
24. 24.Which is closest to 297 + 704 + 795? (a) 1700 (b) 1900 (c) 2000 (d) 1800
25. 25.Which is closest to 700 × 51? (Round each number first.) (a) 35000 (b) 350000 (c) 70000 (d) 3500
26. 26.Round 50.92 to one decimal place. =
27. 27.Round 37.59 to one decimal place. =
28. 28.Which is closest to 102 + 99 + 804? (a) 1200 (b) 1100 (c) 900 (d) 1000
29. 29.Which is closest to 703 × 19? (Round each number first.) (a) 1400 (b) 28000 (c) 14000 (d) 140000
30. 30.Round 21.38 to one decimal place. =
31. 31.Which is closest to 502 × 62? (Round each number first.) (a) 3000 (b) 30000 (c) 300000 (d) 60000
32. 32.Round 12428 to the nearest thousand.
33. 33.Which is closest to 203 × 48? (Round each number first.) (a) 100000 (b) 1000 (c) 20000 (d) 10000
34. 34.Which is closest to 705 + 496 + 101? (a) 1200 (b) 1500 (c) 1300 (d) 1400
35. 35.Which is closest to 1406 ÷ 19? (a) 140 (b) 35 (c) 700 (d) 70
36. 36.Which is closest to 3598 ÷ 41? (a) 45 (b) 900 (c) 90 (d) 180
37. 37.Which is closest to 404 × 59? (Round each number first.) (a) 240000 (b) 24000 (c) 2400 (d) 48000
38. 38.Round 68610 to the nearest hundred.
39. 39.Which is closest to 904 ÷ 31? (a) 15 (b) 30 (c) 300 (d) 60
40. 40.Which is closest to 200 + 600 + 301? (a) 1200 (b) 1000 (c) 1300 (d) 1100

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