Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 227 · 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.Round 89332 to the nearest thousand.
2. 2.Round 84001 to the nearest ten.
3. 3.Round 80781 to the nearest ten.
4. 4.Which is closest to 402 × 78? (Round each number first.) (a) 64000 (b) 32000 (c) 320000 (d) 3200
5. 5.Round 33.87 to one decimal place. =
6. 6.Which is closest to 898 + 99 + 96? (a) 1200 (b) 1000 (c) 1300 (d) 1100
7. 7.Round 70370 to the nearest hundred.
8. 8.Which is closest to 204 × 81? (Round each number first.) (a) 1600 (b) 160000 (c) 32000 (d) 16000
9. 9.Round 68.63 to one decimal place. =
10. 10.Which is closest to 598 × 58? (Round each number first.) (a) 360000 (b) 36000 (c) 3600 (d) 72000
11. 11.Which is closest to 403 + 695 + 104? (a) 1400 (b) 1300 (c) 1200 (d) 1100
12. 12.Which is closest to 602 × 59? (Round each number first.) (a) 360000 (b) 72000 (c) 3600 (d) 36000
13. 13.Round 17.84 to one decimal place. =
14. 14.Round 71.07 to one decimal place. =
15. 15.Round 30484 to the nearest ten.
16. 16.Round 19052 to the nearest ten.
17. 17.Which is closest to 495 + 205 + 902? (a) 1500 (b) 1800 (c) 1700 (d) 1600
18. 18.Round 11262 to the nearest hundred.
19. 19.Round 20.24 to one decimal place. =
20. 20.Round 83319 to the nearest thousand.
21. 21.Round 88.44 to one decimal place. =
22. 22.Which is closest to 600 × 38? (Round each number first.) (a) 48000 (b) 24000 (c) 240000 (d) 2400
23. 23.Which is closest to 399 × 39? (Round each number first.) (a) 1600 (b) 32000 (c) 160000 (d) 16000
24. 24.Which is closest to 297 × 48? (Round each number first.) (a) 30000 (b) 150000 (c) 15000 (d) 1500
25. 25.Round 19.33 to one decimal place. =
26. 26.Round 25.47 to one decimal place. =
27. 27.Which is closest to 3592 ÷ 41? (a) 900 (b) 45 (c) 180 (d) 90
28. 28.Which is closest to 101 + 599 + 99? (a) 800 (b) 900 (c) 1000 (d) 700
29. 29.Which is closest to 404 × 29? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
30. 30.Which is closest to 1193 ÷ 31? (a) 400 (b) 20 (c) 40 (d) 80
31. 31.Which is closest to 797 × 40? (Round each number first.) (a) 64000 (b) 3200 (c) 320000 (d) 32000
32. 32.Which is closest to 392 ÷ 19? (a) 40 (b) 200 (c) 20 (d) 10
33. 33.Round 64055 to the nearest thousand.
34. 34.Round 50079 to the nearest hundred.
35. 35.Which is closest to 199 × 91? (Round each number first.) (a) 18000 (b) 36000 (c) 180000 (d) 1800
36. 36.Round 22740 to the nearest thousand.
37. 37.Which is closest to 903 × 31? (Round each number first.) (a) 27000 (b) 54000 (c) 270000 (d) 2700
38. 38.Which is closest to 405 + 599 + 595? (a) 1700 (b) 1600 (c) 1500 (d) 1800
39. 39.Round 23.37 to one decimal place. =
40. 40.Which is closest to 596 ÷ 19? (a) 300 (b) 60 (c) 30 (d) 15

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