Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 538 · 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 597 + 197 + 101? (a) 1100 (b) 800 (c) 900 (d) 1000
2. 2.Which is closest to 902 × 18? (Round each number first.) (a) 180000 (b) 18000 (c) 1800 (d) 36000
3. 3.Round 31.78 to one decimal place. =
4. 4.Which is closest to 404 × 38? (Round each number first.) (a) 1600 (b) 16000 (c) 160000 (d) 32000
5. 5.Which is closest to 203 × 79? (Round each number first.) (a) 1600 (b) 32000 (c) 160000 (d) 16000
6. 6.Which is closest to 1798 ÷ 29? (a) 30 (b) 120 (c) 60 (d) 600
7. 7.Which is closest to 400 + 298 + 302? (a) 1100 (b) 900 (c) 1200 (d) 1000
8. 8.Which is closest to 503 × 20? (Round each number first.) (a) 20000 (b) 10000 (c) 100000 (d) 1000
9. 9.Round 94.59 to one decimal place. =
10. 10.Which is closest to 400 × 59? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
11. 11.Which is closest to 303 × 78? (Round each number first.) (a) 48000 (b) 2400 (c) 240000 (d) 24000
12. 12.Which is closest to 797 × 30? (Round each number first.) (a) 240000 (b) 48000 (c) 24000 (d) 2400
13. 13.Which is closest to 799 ÷ 41? (a) 40 (b) 20 (c) 10 (d) 200
14. 14.Which is closest to 398 × 61? (Round each number first.) (a) 2400 (b) 24000 (c) 240000 (d) 48000
15. 15.Which is closest to 399 × 48? (Round each number first.) (a) 40000 (b) 200000 (c) 20000 (d) 2000
16. 16.Which is closest to 995 ÷ 49? (a) 200 (b) 10 (c) 40 (d) 20
17. 17.Round 34.56 to one decimal place. =
18. 18.Which is closest to 503 × 18? (Round each number first.) (a) 100000 (b) 1000 (c) 20000 (d) 10000
19. 19.Which is closest to 496 × 82? (Round each number first.) (a) 4000 (b) 80000 (c) 40000 (d) 400000
20. 20.Round 46.38 to one decimal place. =
21. 21.Which is closest to 296 × 22? (Round each number first.) (a) 6000 (b) 600 (c) 60000 (d) 12000
22. 22.Which is closest to 104 + 303 + 895? (a) 1500 (b) 1400 (c) 1200 (d) 1300
23. 23.Which is closest to 895 + 495 + 498? (a) 2100 (b) 2000 (c) 1800 (d) 1900
24. 24.Which is closest to 204 + 896 + 95? (a) 1300 (b) 1200 (c) 1100 (d) 1400
25. 25.Round 76.77 to one decimal place. =
26. 26.Which is closest to 597 × 91? (Round each number first.) (a) 540000 (b) 5400 (c) 54000 (d) 108000
27. 27.Round 21475 to the nearest thousand.
28. 28.Which is closest to 1395 ÷ 21? (a) 700 (b) 35 (c) 140 (d) 70
29. 29.Round 71.76 to one decimal place. =
30. 30.Round 49273 to the nearest hundred.
31. 31.Which is closest to 197 × 32? (Round each number first.) (a) 60000 (b) 600 (c) 12000 (d) 6000
32. 32.Round 55.94 to one decimal place. =
33. 33.Which is closest to 100 + 96 + 302? (a) 700 (b) 500 (c) 600 (d) 400
34. 34.Which is closest to 196 × 41? (Round each number first.) (a) 800 (b) 16000 (c) 8000 (d) 80000
35. 35.Which is closest to 497 × 18? (Round each number first.) (a) 100000 (b) 10000 (c) 1000 (d) 20000
36. 36.Which is closest to 196 × 50? (Round each number first.) (a) 20000 (b) 10000 (c) 1000 (d) 100000
37. 37.Round 61168 to the nearest ten.
38. 38.Which is closest to 101 + 302 + 696? (a) 1000 (b) 1200 (c) 1100 (d) 1300
39. 39.Which is closest to 496 + 596 + 198? (a) 1500 (b) 1300 (c) 1200 (d) 1400
40. 40.Round 76.51 to one decimal place. =

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