Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 503 · 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 1203 ÷ 21? (a) 60 (b) 600 (c) 30 (d) 120
2. 2.Which is closest to 600 ÷ 19? (a) 15 (b) 60 (c) 300 (d) 30
3. 3.Which is closest to 700 × 58? (Round each number first.) (a) 84000 (b) 42000 (c) 420000 (d) 4200
4. 4.Which is closest to 897 × 39? (Round each number first.) (a) 360000 (b) 3600 (c) 72000 (d) 36000
5. 5.Which is closest to 898 + 899 + 897? (a) 2600 (b) 2800 (c) 2700 (d) 2900
6. 6.Which is closest to 600 × 88? (Round each number first.) (a) 108000 (b) 5400 (c) 54000 (d) 540000
7. 7.Which is closest to 201 + 396 + 796? (a) 1300 (b) 1400 (c) 1600 (d) 1500
8. 8.Which is closest to 803 × 51? (Round each number first.) (a) 400000 (b) 80000 (c) 40000 (d) 4000
9. 9.Which is closest to 703 × 48? (Round each number first.) (a) 350000 (b) 70000 (c) 35000 (d) 3500
10. 10.Which is closest to 1792 ÷ 19? (a) 900 (b) 90 (c) 180 (d) 45
11. 11.Which is closest to 1593 ÷ 19? (a) 80 (b) 40 (c) 800 (d) 160
12. 12.Which is closest to 404 × 32? (Round each number first.) (a) 12000 (b) 1200 (c) 120000 (d) 24000
13. 13.Which is closest to 705 + 205 + 899? (a) 1900 (b) 1800 (c) 2000 (d) 1700
14. 14.Which is closest to 296 + 300 + 195? (a) 900 (b) 1000 (c) 700 (d) 800
15. 15.Which is closest to 702 × 19? (Round each number first.) (a) 1400 (b) 140000 (c) 28000 (d) 14000
16. 16.Which is closest to 702 × 91? (Round each number first.) (a) 630000 (b) 126000 (c) 63000 (d) 6300
17. 17.Round 44399 to the nearest thousand.
18. 18.Which is closest to 596 + 298 + 698? (a) 1500 (b) 1800 (c) 1700 (d) 1600
19. 19.Which is closest to 902 × 89? (Round each number first.) (a) 162000 (b) 810000 (c) 81000 (d) 8100
20. 20.Which is closest to 99 + 798 + 799? (a) 1900 (b) 1600 (c) 1800 (d) 1700
21. 21.Which is closest to 299 × 81? (Round each number first.) (a) 2400 (b) 24000 (c) 48000 (d) 240000
22. 22.Which is closest to 502 × 62? (Round each number first.) (a) 60000 (b) 300000 (c) 3000 (d) 30000
23. 23.Round 1904 to the nearest hundred.
24. 24.Which is closest to 98 + 198 + 901? (a) 1200 (b) 1300 (c) 1400 (d) 1100
25. 25.Round 25.28 to one decimal place. =
26. 26.Which is closest to 502 + 400 + 304? (a) 1300 (b) 1400 (c) 1100 (d) 1200
27. 27.Which is closest to 1494 ÷ 29? (a) 100 (b) 50 (c) 500 (d) 25
28. 28.Which is closest to 805 + 199 + 303? (a) 1200 (b) 1400 (c) 1300 (d) 1500
29. 29.Which is closest to 899 × 20? (Round each number first.) (a) 18000 (b) 1800 (c) 36000 (d) 180000
30. 30.Round 18.11 to one decimal place. =
31. 31.Round 49.67 to one decimal place. =
32. 32.Which is closest to 800 × 38? (Round each number first.) (a) 32000 (b) 3200 (c) 64000 (d) 320000
33. 33.Which is closest to 1602 ÷ 21? (a) 40 (b) 160 (c) 80 (d) 800
34. 34.Round 29864 to the nearest hundred.
35. 35.Which is closest to 698 × 59? (Round each number first.) (a) 4200 (b) 420000 (c) 42000 (d) 84000
36. 36.Which is closest to 1003 ÷ 51? (a) 40 (b) 20 (c) 10 (d) 200
37. 37.Round 19733 to the nearest thousand.
38. 38.Round 92.46 to one decimal place. =
39. 39.Which is closest to 695 + 505 + 898? (a) 2000 (b) 2300 (c) 2200 (d) 2100
40. 40.Which is closest to 399 × 49? (Round each number first.) (a) 2000 (b) 40000 (c) 20000 (d) 200000

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