Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 951 · 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 800 × 42? (Round each number first.) (a) 320000 (b) 3200 (c) 64000 (d) 32000
2. 2.Which is closest to 403 × 18? (Round each number first.) (a) 16000 (b) 800 (c) 80000 (d) 8000
3. 3.Which is closest to 597 × 69? (Round each number first.) (a) 420000 (b) 4200 (c) 84000 (d) 42000
4. 4.Which is closest to 803 × 31? (Round each number first.) (a) 2400 (b) 24000 (c) 48000 (d) 240000
5. 5.Round 2168 to the nearest ten.
6. 6.Which is closest to 304 × 81? (Round each number first.) (a) 24000 (b) 2400 (c) 240000 (d) 48000
7. 7.Which is closest to 701 × 41? (Round each number first.) (a) 2800 (b) 56000 (c) 28000 (d) 280000
8. 8.Which is closest to 902 × 79? (Round each number first.) (a) 144000 (b) 720000 (c) 72000 (d) 7200
9. 9.Which is closest to 202 × 42? (Round each number first.) (a) 8000 (b) 80000 (c) 16000 (d) 800
10. 10.Round 55.49 to one decimal place. =
11. 11.Which is closest to 896 ÷ 31? (a) 60 (b) 15 (c) 300 (d) 30
12. 12.Which is closest to 201 + 196 + 501? (a) 900 (b) 800 (c) 1000 (d) 1100
13. 13.Which is closest to 201 + 799 + 200? (a) 1200 (b) 1100 (c) 1400 (d) 1300
14. 14.Which is closest to 197 × 92? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000
15. 15.Round 53586 to the nearest hundred.
16. 16.Which is closest to 809 ÷ 21? (a) 40 (b) 400 (c) 20 (d) 80
17. 17.Round 80.61 to one decimal place. =
18. 18.Round 68.36 to one decimal place. =
19. 19.Which is closest to 301 + 300 + 503? (a) 1300 (b) 1100 (c) 1200 (d) 1000
20. 20.Which is closest to 504 × 40? (Round each number first.) (a) 20000 (b) 200000 (c) 2000 (d) 40000
21. 21.Round 82.33 to one decimal place. =
22. 22.Round 4507 to the nearest hundred.
23. 23.Round 96.63 to one decimal place. =
24. 24.Round 75875 to the nearest thousand.
25. 25.Round 68549 to the nearest ten.
26. 26.Round 75591 to the nearest ten.
27. 27.Round 4537 to the nearest thousand.
28. 28.Which is closest to 2405 ÷ 41? (a) 60 (b) 30 (c) 600 (d) 120
29. 29.Round 58.91 to one decimal place. =
30. 30.Which is closest to 796 × 31? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
31. 31.Which is closest to 1994 ÷ 41? (a) 500 (b) 25 (c) 50 (d) 100
32. 32.Which is closest to 1003 ÷ 51? (a) 200 (b) 10 (c) 40 (d) 20
33. 33.Which is closest to 398 × 39? (Round each number first.) (a) 160000 (b) 1600 (c) 16000 (d) 32000
34. 34.Which is closest to 903 + 905 + 604? (a) 2500 (b) 2600 (c) 2300 (d) 2400
35. 35.Which is closest to 703 + 503 + 200? (a) 1600 (b) 1400 (c) 1300 (d) 1500
36. 36.Which is closest to 796 × 38? (Round each number first.) (a) 320000 (b) 3200 (c) 32000 (d) 64000
37. 37.Which is closest to 298 × 92? (Round each number first.) (a) 270000 (b) 54000 (c) 2700 (d) 27000
38. 38.Which is closest to 901 × 31? (Round each number first.) (a) 2700 (b) 54000 (c) 270000 (d) 27000
39. 39.Round 88.76 to one decimal place. =
40. 40.Which is closest to 103 + 801 + 104? (a) 900 (b) 1100 (c) 1000 (d) 1200

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