Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 335 · 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 401 × 78? (Round each number first.) (a) 32000 (b) 3200 (c) 64000 (d) 320000
2. 2.Which is closest to 797 × 59? (Round each number first.) (a) 48000 (b) 96000 (c) 4800 (d) 480000
3. 3.Round 15.59 to one decimal place. =
4. 4.Which is closest to 202 × 38? (Round each number first.) (a) 16000 (b) 800 (c) 8000 (d) 80000
5. 5.Which is closest to 896 × 50? (Round each number first.) (a) 450000 (b) 90000 (c) 45000 (d) 4500
6. 6.Round 76708 to the nearest thousand.
7. 7.Which is closest to 798 × 42? (Round each number first.) (a) 32000 (b) 320000 (c) 3200 (d) 64000
8. 8.Round 19437 to the nearest ten.
9. 9.Round 29.74 to one decimal place. =
10. 10.Round 94648 to the nearest thousand.
11. 11.Which is closest to 500 × 79? (Round each number first.) (a) 40000 (b) 80000 (c) 4000 (d) 400000
12. 12.Which is closest to 604 ÷ 31? (a) 40 (b) 200 (c) 10 (d) 20
13. 13.Round 30.27 to one decimal place. =
14. 14.Which is closest to 599 × 41? (Round each number first.) (a) 240000 (b) 24000 (c) 2400 (d) 48000
15. 15.Round 32127 to the nearest thousand.
16. 16.Round 51.13 to one decimal place. =
17. 17.Round 9661 to the nearest ten.
18. 18.Round 16.34 to one decimal place. =
19. 19.Round 32.51 to one decimal place. =
20. 20.Which is closest to 597 ÷ 31? (a) 20 (b) 10 (c) 200 (d) 40
21. 21.Round 24.79 to one decimal place. =
22. 22.Which is closest to 601 × 48? (Round each number first.) (a) 3000 (b) 60000 (c) 300000 (d) 30000
23. 23.Which is closest to 400 + 204 + 700? (a) 1300 (b) 1200 (c) 1400 (d) 1500
24. 24.Which is closest to 595 + 500 + 499? (a) 1800 (b) 1700 (c) 1600 (d) 1500
25. 25.Which is closest to 305 + 301 + 395? (a) 1100 (b) 1200 (c) 1000 (d) 900
26. 26.Round 58323 to the nearest ten.
27. 27.Round 18.07 to one decimal place. =
28. 28.Which is closest to 897 × 81? (Round each number first.) (a) 7200 (b) 720000 (c) 144000 (d) 72000
29. 29.Round 28359 to the nearest ten.
30. 30.Round 96232 to the nearest thousand.
31. 31.Which is closest to 596 × 92? (Round each number first.) (a) 540000 (b) 108000 (c) 5400 (d) 54000
32. 32.Round 20.86 to one decimal place. =
33. 33.Which is closest to 798 + 501 + 297? (a) 1500 (b) 1600 (c) 1800 (d) 1700
34. 34.Round 74521 to the nearest ten.
35. 35.Round 12532 to the nearest ten.
36. 36.Which is closest to 502 × 32? (Round each number first.) (a) 30000 (b) 15000 (c) 1500 (d) 150000
37. 37.Which is closest to 797 + 901 + 904? (a) 2500 (b) 2800 (c) 2600 (d) 2700
38. 38.Round 6319 to the nearest hundred.
39. 39.Which is closest to 893 ÷ 31? (a) 300 (b) 15 (c) 30 (d) 60
40. 40.Which is closest to 2699 ÷ 31? (a) 45 (b) 180 (c) 90 (d) 900

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