Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 721 · 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 91.58 to one decimal place. =
2. 2.Which is closest to 895 + 700 + 295? (a) 2100 (b) 1900 (c) 1800 (d) 2000
3. 3.Which is closest to 502 × 60? (Round each number first.) (a) 60000 (b) 300000 (c) 3000 (d) 30000
4. 4.Which is closest to 1996 ÷ 41? (a) 25 (b) 500 (c) 50 (d) 100
5. 5.Which is closest to 596 + 800 + 797? (a) 2200 (b) 2300 (c) 2400 (d) 2100
6. 6.Which is closest to 804 ÷ 41? (a) 40 (b) 200 (c) 10 (d) 20
7. 7.Which is closest to 204 × 82? (Round each number first.) (a) 32000 (b) 1600 (c) 160000 (d) 16000
8. 8.Round 16.79 to one decimal place. =
9. 9.Which is closest to 402 + 395 + 704? (a) 1700 (b) 1400 (c) 1500 (d) 1600
10. 10.Which is closest to 801 + 397 + 199? (a) 1400 (b) 1300 (c) 1500 (d) 1600
11. 11.Which is closest to 701 × 31? (Round each number first.) (a) 42000 (b) 2100 (c) 21000 (d) 210000
12. 12.Which is closest to 2105 ÷ 29? (a) 700 (b) 140 (c) 70 (d) 35
13. 13.Which is closest to 1995 ÷ 49? (a) 20 (b) 400 (c) 80 (d) 40
14. 14.Which is closest to 595 ÷ 21? (a) 30 (b) 60 (c) 15 (d) 300
15. 15.Which is closest to 409 ÷ 21? (a) 10 (b) 40 (c) 20 (d) 200
16. 16.Which is closest to 1209 ÷ 41? (a) 300 (b) 60 (c) 30 (d) 15
17. 17.Which is closest to 997 ÷ 49? (a) 10 (b) 200 (c) 20 (d) 40
18. 18.Round 57.22 to one decimal place. =
19. 19.Which is closest to 798 × 28? (Round each number first.) (a) 2400 (b) 240000 (c) 24000 (d) 48000
20. 20.Round 91.91 to one decimal place. =
21. 21.Which is closest to 198 + 299 + 304? (a) 700 (b) 1000 (c) 800 (d) 900
22. 22.Round 55.19 to one decimal place. =
23. 23.Round 45.48 to one decimal place. =
24. 24.Which is closest to 304 × 40? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
25. 25.Which is closest to 700 × 48? (Round each number first.) (a) 350000 (b) 35000 (c) 3500 (d) 70000
26. 26.Which is closest to 3195 ÷ 39? (a) 800 (b) 160 (c) 40 (d) 80
27. 27.Which is closest to 903 + 800 + 102? (a) 1800 (b) 1700 (c) 2000 (d) 1900
28. 28.Which is closest to 498 × 41? (Round each number first.) (a) 2000 (b) 200000 (c) 20000 (d) 40000
29. 29.Which is closest to 697 × 61? (Round each number first.) (a) 84000 (b) 4200 (c) 42000 (d) 420000
30. 30.Round 94611 to the nearest ten.
31. 31.Which is closest to 900 × 32? (Round each number first.) (a) 27000 (b) 2700 (c) 54000 (d) 270000
32. 32.Which is closest to 498 × 18? (Round each number first.) (a) 10000 (b) 1000 (c) 20000 (d) 100000
33. 33.Which is closest to 3191 ÷ 39? (a) 40 (b) 80 (c) 160 (d) 800
34. 34.Which is closest to 401 × 90? (Round each number first.) (a) 36000 (b) 360000 (c) 72000 (d) 3600
35. 35.Which is closest to 904 × 20? (Round each number first.) (a) 180000 (b) 36000 (c) 1800 (d) 18000
36. 36.Which is closest to 698 × 70? (Round each number first.) (a) 490000 (b) 98000 (c) 49000 (d) 4900
37. 37.Which is closest to 202 + 500 + 705? (a) 1500 (b) 1600 (c) 1400 (d) 1300
38. 38.Round 80.23 to one decimal place. =
39. 39.Round 23076 to the nearest thousand.
40. 40.Which is closest to 3608 ÷ 39? (a) 900 (b) 180 (c) 45 (d) 90

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