Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 359 · 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 15.14 to one decimal place. =
2. 2.Round 28.94 to one decimal place. =
3. 3.Which is closest to 396 × 61? (Round each number first.) (a) 2400 (b) 24000 (c) 48000 (d) 240000
4. 4.Round 50446 to the nearest thousand.
5. 5.Which is closest to 599 × 58? (Round each number first.) (a) 72000 (b) 36000 (c) 3600 (d) 360000
6. 6.Which is closest to 499 + 95 + 598? (a) 1300 (b) 1200 (c) 1100 (d) 1400
7. 7.Round 85871 to the nearest hundred.
8. 8.Which is closest to 601 × 21? (Round each number first.) (a) 1200 (b) 24000 (c) 12000 (d) 120000
9. 9.Round 43072 to the nearest thousand.
10. 10.Which is closest to 598 + 305 + 700? (a) 1500 (b) 1800 (c) 1600 (d) 1700
11. 11.Which is closest to 201 × 72? (Round each number first.) (a) 1400 (b) 140000 (c) 28000 (d) 14000
12. 12.Round 28865 to the nearest hundred.
13. 13.Which is closest to 799 × 78? (Round each number first.) (a) 64000 (b) 6400 (c) 128000 (d) 640000
14. 14.Round 18776 to the nearest thousand.
15. 15.Which is closest to 304 × 69? (Round each number first.) (a) 42000 (b) 21000 (c) 2100 (d) 210000
16. 16.Which is closest to 795 + 698 + 800? (a) 2200 (b) 2300 (c) 2500 (d) 2400
17. 17.Which is closest to 497 × 92? (Round each number first.) (a) 45000 (b) 4500 (c) 90000 (d) 450000
18. 18.Round 30.51 to one decimal place. =
19. 19.Which is closest to 499 × 50? (Round each number first.) (a) 25000 (b) 2500 (c) 50000 (d) 250000
20. 20.Round 25.37 to one decimal place. =
21. 21.Which is closest to 598 × 18? (Round each number first.) (a) 12000 (b) 120000 (c) 24000 (d) 1200
22. 22.Round 44467 to the nearest ten.
23. 23.Which is closest to 498 × 82? (Round each number first.) (a) 400000 (b) 4000 (c) 40000 (d) 80000
24. 24.Round 78599 to the nearest hundred.
25. 25.Which is closest to 3508 ÷ 51? (a) 140 (b) 70 (c) 35 (d) 700
26. 26.Round 46158 to the nearest ten.
27. 27.Round 32.21 to one decimal place. =
28. 28.Round 19.54 to one decimal place. =
29. 29.Which is closest to 403 × 29? (Round each number first.) (a) 120000 (b) 12000 (c) 24000 (d) 1200
30. 30.Which is closest to 705 + 496 + 795? (a) 1900 (b) 2200 (c) 2100 (d) 2000
31. 31.Which is closest to 905 + 800 + 895? (a) 2500 (b) 2700 (c) 2800 (d) 2600
32. 32.Which is closest to 203 × 90? (Round each number first.) (a) 1800 (b) 36000 (c) 18000 (d) 180000
33. 33.Which is closest to 803 + 496 + 101? (a) 1300 (b) 1600 (c) 1500 (d) 1400
34. 34.Which is closest to 103 + 897 + 198? (a) 1300 (b) 1400 (c) 1200 (d) 1100
35. 35.Which is closest to 802 × 32? (Round each number first.) (a) 2400 (b) 24000 (c) 48000 (d) 240000
36. 36.Which is closest to 402 + 404 + 796? (a) 1700 (b) 1600 (c) 1500 (d) 1800
37. 37.Which is closest to 598 × 50? (Round each number first.) (a) 60000 (b) 30000 (c) 300000 (d) 3000
38. 38.Which is closest to 598 × 51? (Round each number first.) (a) 300000 (b) 60000 (c) 30000 (d) 3000
39. 39.Which is closest to 501 × 39? (Round each number first.) (a) 20000 (b) 40000 (c) 2000 (d) 200000
40. 40.Which is closest to 1409 ÷ 19? (a) 140 (b) 700 (c) 35 (d) 70

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