Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 72 · 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 405 + 601 + 502? (a) 1400 (b) 1700 (c) 1500 (d) 1600
2. 2.Which is closest to 901 ÷ 31? (a) 15 (b) 300 (c) 60 (d) 30
3. 3.Round 94.77 to one decimal place. =
4. 4.Which is closest to 598 × 22? (Round each number first.) (a) 12000 (b) 120000 (c) 1200 (d) 24000
5. 5.Which is closest to 696 × 61? (Round each number first.) (a) 420000 (b) 42000 (c) 4200 (d) 84000
6. 6.Which is closest to 895 + 901 + 799? (a) 2600 (b) 2500 (c) 2700 (d) 2800
7. 7.Round 44960 to the nearest thousand.
8. 8.Round 69865 to the nearest thousand.
9. 9.Which is closest to 403 + 102 + 298? (a) 700 (b) 900 (c) 800 (d) 1000
10. 10.Which is closest to 301 + 404 + 705? (a) 1500 (b) 1600 (c) 1300 (d) 1400
11. 11.Round 7622 to the nearest hundred.
12. 12.Which is closest to 598 × 60? (Round each number first.) (a) 360000 (b) 72000 (c) 36000 (d) 3600
13. 13.Which is closest to 300 × 88? (Round each number first.) (a) 54000 (b) 27000 (c) 270000 (d) 2700
14. 14.Which is closest to 1403 ÷ 21? (a) 70 (b) 140 (c) 35 (d) 700
15. 15.Which is closest to 703 × 31? (Round each number first.) (a) 21000 (b) 42000 (c) 210000 (d) 2100
16. 16.Which is closest to 597 × 19? (Round each number first.) (a) 24000 (b) 120000 (c) 12000 (d) 1200
17. 17.Round 67.22 to one decimal place. =
18. 18.Round 56.24 to one decimal place. =
19. 19.Round 17299 to the nearest hundred.
20. 20.Which is closest to 200 × 79? (Round each number first.) (a) 32000 (b) 160000 (c) 16000 (d) 1600
21. 21.Which is closest to 397 + 204 + 404? (a) 1100 (b) 1200 (c) 900 (d) 1000
22. 22.Which is closest to 1194 ÷ 39? (a) 30 (b) 60 (c) 15 (d) 300
23. 23.Which is closest to 805 + 802 + 705? (a) 2500 (b) 2400 (c) 2200 (d) 2300
24. 24.Which is closest to 902 × 41? (Round each number first.) (a) 36000 (b) 360000 (c) 72000 (d) 3600
25. 25.Round 9953 to the nearest ten.
26. 26.Which is closest to 499 × 21? (Round each number first.) (a) 10000 (b) 20000 (c) 1000 (d) 100000
27. 27.Which is closest to 897 × 38? (Round each number first.) (a) 36000 (b) 360000 (c) 72000 (d) 3600
28. 28.Which is closest to 501 × 18? (Round each number first.) (a) 10000 (b) 1000 (c) 100000 (d) 20000
29. 29.Which is closest to 902 × 49? (Round each number first.) (a) 450000 (b) 45000 (c) 90000 (d) 4500
30. 30.Which is closest to 2393 ÷ 29? (a) 160 (b) 80 (c) 40 (d) 800
31. 31.Which is closest to 905 + 104 + 399? (a) 1300 (b) 1400 (c) 1600 (d) 1500
32. 32.Round 30.07 to one decimal place. =
33. 33.Which is closest to 599 × 68? (Round each number first.) (a) 4200 (b) 42000 (c) 84000 (d) 420000
34. 34.Which is closest to 601 × 22? (Round each number first.) (a) 12000 (b) 24000 (c) 120000 (d) 1200
35. 35.Round 63.09 to one decimal place. =
36. 36.Round 94232 to the nearest ten.
37. 37.Which is closest to 399 × 38? (Round each number first.) (a) 160000 (b) 32000 (c) 1600 (d) 16000
38. 38.Round 62.11 to one decimal place. =
39. 39.Round 34.71 to one decimal place. =
40. 40.Which is closest to 3609 ÷ 39? (a) 45 (b) 180 (c) 90 (d) 900

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