Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 431 · 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 798 × 50? (Round each number first.) (a) 80000 (b) 4000 (c) 400000 (d) 40000
2. 2.Which is closest to 2408 ÷ 41? (a) 600 (b) 30 (c) 60 (d) 120
3. 3.Which is closest to 302 × 59? (Round each number first.) (a) 36000 (b) 1800 (c) 180000 (d) 18000
4. 4.Which is closest to 2099 ÷ 31? (a) 140 (b) 35 (c) 70 (d) 700
5. 5.Which is closest to 600 + 102 + 903? (a) 1600 (b) 1800 (c) 1700 (d) 1500
6. 6.Which is closest to 904 × 49? (Round each number first.) (a) 90000 (b) 450000 (c) 4500 (d) 45000
7. 7.Round 35.92 to one decimal place. =
8. 8.Round 78644 to the nearest hundred.
9. 9.Which is closest to 204 + 305 + 895? (a) 1300 (b) 1500 (c) 1600 (d) 1400
10. 10.Which is closest to 404 × 21? (Round each number first.) (a) 800 (b) 80000 (c) 16000 (d) 8000
11. 11.Which is closest to 304 + 904 + 705? (a) 1800 (b) 2000 (c) 1900 (d) 2100
12. 12.Which is closest to 297 + 295 + 204? (a) 900 (b) 700 (c) 1000 (d) 800
13. 13.Which is closest to 804 + 696 + 105? (a) 1500 (b) 1800 (c) 1700 (d) 1600
14. 14.Round 18086 to the nearest ten.
15. 15.Which is closest to 702 × 21? (Round each number first.) (a) 14000 (b) 140000 (c) 1400 (d) 28000
16. 16.Round 72533 to the nearest ten.
17. 17.Which is closest to 796 + 604 + 698? (a) 2300 (b) 2200 (c) 2000 (d) 2100
18. 18.Which is closest to 197 × 28? (Round each number first.) (a) 60000 (b) 6000 (c) 600 (d) 12000
19. 19.Round 20196 to the nearest hundred.
20. 20.Round 79.18 to one decimal place. =
21. 21.Round 92.34 to one decimal place. =
22. 22.Which is closest to 1506 ÷ 31? (a) 500 (b) 25 (c) 50 (d) 100
23. 23.Round 87.91 to one decimal place. =
24. 24.Which is closest to 199 × 50? (Round each number first.) (a) 20000 (b) 1000 (c) 10000 (d) 100000
25. 25.Which is closest to 798 × 51? (Round each number first.) (a) 4000 (b) 40000 (c) 400000 (d) 80000
26. 26.Round 97.37 to one decimal place. =
27. 27.Which is closest to 4492 ÷ 51? (a) 180 (b) 45 (c) 900 (d) 90
28. 28.Which is closest to 599 × 62? (Round each number first.) (a) 360000 (b) 3600 (c) 72000 (d) 36000
29. 29.Which is closest to 303 × 79? (Round each number first.) (a) 240000 (b) 2400 (c) 24000 (d) 48000
30. 30.Which is closest to 605 ÷ 31? (a) 20 (b) 40 (c) 10 (d) 200
31. 31.Which is closest to 803 + 795 + 196? (a) 2000 (b) 1800 (c) 1900 (d) 1700
32. 32.Which is closest to 1207 ÷ 31? (a) 20 (b) 40 (c) 400 (d) 80
33. 33.Which is closest to 396 × 90? (Round each number first.) (a) 360000 (b) 3600 (c) 36000 (d) 72000
34. 34.Which is closest to 1209 ÷ 19? (a) 30 (b) 120 (c) 60 (d) 600
35. 35.Which is closest to 298 × 51? (Round each number first.) (a) 15000 (b) 150000 (c) 1500 (d) 30000
36. 36.Which is closest to 1009 ÷ 49? (a) 40 (b) 10 (c) 200 (d) 20
37. 37.Round 29.29 to one decimal place. =
38. 38.Which is closest to 702 + 604 + 103? (a) 1400 (b) 1500 (c) 1300 (d) 1600
39. 39.Which is closest to 596 + 898 + 97? (a) 1700 (b) 1500 (c) 1600 (d) 1800
40. 40.Which is closest to 203 × 81? (Round each number first.) (a) 160000 (b) 1600 (c) 32000 (d) 16000

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