Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 857 · 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 502 × 62? (Round each number first.) (a) 300000 (b) 30000 (c) 3000 (d) 60000
2. 2.Round 23.91 to one decimal place. =
3. 3.Which is closest to 501 × 42? (Round each number first.) (a) 20000 (b) 40000 (c) 200000 (d) 2000
4. 4.Which is closest to 597 × 30? (Round each number first.) (a) 180000 (b) 36000 (c) 18000 (d) 1800
5. 5.Which is closest to 600 + 698 + 105? (a) 1300 (b) 1400 (c) 1600 (d) 1500
6. 6.Which is closest to 803 ÷ 21? (a) 400 (b) 80 (c) 20 (d) 40
7. 7.Which is closest to 297 × 79? (Round each number first.) (a) 48000 (b) 240000 (c) 24000 (d) 2400
8. 8.Round 26.92 to one decimal place. =
9. 9.Round 61651 to the nearest hundred.
10. 10.Which is closest to 1796 ÷ 19? (a) 900 (b) 180 (c) 45 (d) 90
11. 11.Round 98681 to the nearest hundred.
12. 12.Which is closest to 803 + 99 + 804? (a) 1900 (b) 1700 (c) 1600 (d) 1800
13. 13.Which is closest to 1594 ÷ 39? (a) 80 (b) 40 (c) 20 (d) 400
14. 14.Round 49.06 to one decimal place. =
15. 15.Round 60270 to the nearest hundred.
16. 16.Round 34.82 to one decimal place. =
17. 17.Which is closest to 500 × 78? (Round each number first.) (a) 80000 (b) 40000 (c) 4000 (d) 400000
18. 18.Which is closest to 896 × 58? (Round each number first.) (a) 5400 (b) 540000 (c) 108000 (d) 54000
19. 19.Which is closest to 304 × 32? (Round each number first.) (a) 900 (b) 18000 (c) 90000 (d) 9000
20. 20.Round 21.32 to one decimal place. =
21. 21.Round 64124 to the nearest thousand.
22. 22.Round 58.51 to one decimal place. =
23. 23.Round 12.09 to one decimal place. =
24. 24.Round 98649 to the nearest hundred.
25. 25.Which is closest to 502 × 78? (Round each number first.) (a) 400000 (b) 80000 (c) 4000 (d) 40000
26. 26.Which is closest to 402 ÷ 19? (a) 200 (b) 20 (c) 10 (d) 40
27. 27.Round 98.06 to one decimal place. =
28. 28.Round 19.12 to one decimal place. =
29. 29.Round 54211 to the nearest ten.
30. 30.Round 50.39 to one decimal place. =
31. 31.Round 30.37 to one decimal place. =
32. 32.Round 25.64 to one decimal place. =
33. 33.Which is closest to 101 + 797 + 395? (a) 1500 (b) 1300 (c) 1200 (d) 1400
34. 34.Which is closest to 98 + 303 + 201? (a) 500 (b) 600 (c) 700 (d) 800
35. 35.Which is closest to 805 + 797 + 295? (a) 1800 (b) 1900 (c) 2000 (d) 2100
36. 36.Which is closest to 899 + 699 + 796? (a) 2400 (b) 2600 (c) 2300 (d) 2500
37. 37.Which is closest to 699 × 19? (Round each number first.) (a) 1400 (b) 140000 (c) 28000 (d) 14000
38. 38.Which is closest to 603 × 88? (Round each number first.) (a) 108000 (b) 54000 (c) 5400 (d) 540000
39. 39.Round 43.39 to one decimal place. =
40. 40.Which is closest to 404 + 400 + 302? (a) 1100 (b) 1300 (c) 1000 (d) 1200

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