Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 205 · 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 2393 ÷ 39? (a) 600 (b) 120 (c) 60 (d) 30
2. 2.Which is closest to 303 × 60? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
3. 3.Round 16.27 to one decimal place. =
4. 4.Round 51399 to the nearest ten.
5. 5.Which is closest to 198 × 68? (Round each number first.) (a) 140000 (b) 28000 (c) 14000 (d) 1400
6. 6.Round 20373 to the nearest thousand.
7. 7.Which is closest to 801 × 69? (Round each number first.) (a) 56000 (b) 560000 (c) 5600 (d) 112000
8. 8.Which is closest to 396 + 296 + 797? (a) 1600 (b) 1500 (c) 1700 (d) 1400
9. 9.Which is closest to 497 × 51? (Round each number first.) (a) 25000 (b) 2500 (c) 250000 (d) 50000
10. 10.Which is closest to 702 × 52? (Round each number first.) (a) 70000 (b) 35000 (c) 3500 (d) 350000
11. 11.Round 24.88 to one decimal place. =
12. 12.Which is closest to 3596 ÷ 39? (a) 90 (b) 45 (c) 180 (d) 900
13. 13.Which is closest to 802 × 60? (Round each number first.) (a) 4800 (b) 96000 (c) 480000 (d) 48000
14. 14.Which is closest to 1006 ÷ 21? (a) 25 (b) 500 (c) 50 (d) 100
15. 15.Round 25650 to the nearest thousand.
16. 16.Round 99.24 to one decimal place. =
17. 17.Round 86.13 to one decimal place. =
18. 18.Which is closest to 297 × 28? (Round each number first.) (a) 18000 (b) 90000 (c) 9000 (d) 900
19. 19.Which is closest to 297 × 71? (Round each number first.) (a) 210000 (b) 21000 (c) 42000 (d) 2100
20. 20.Round 89221 to the nearest hundred.
21. 21.Which is closest to 799 + 401 + 95? (a) 1400 (b) 1500 (c) 1300 (d) 1200
22. 22.Round 61.77 to one decimal place. =
23. 23.Which is closest to 501 × 38? (Round each number first.) (a) 20000 (b) 2000 (c) 40000 (d) 200000
24. 24.Round 34125 to the nearest hundred.
25. 25.Which is closest to 701 + 596 + 497? (a) 1800 (b) 1900 (c) 2000 (d) 1700
26. 26.Which is closest to 701 + 602 + 203? (a) 1500 (b) 1400 (c) 1600 (d) 1700
27. 27.Which is closest to 397 × 30? (Round each number first.) (a) 12000 (b) 24000 (c) 120000 (d) 1200
28. 28.Round 41.77 to one decimal place. =
29. 29.Which is closest to 1208 ÷ 41? (a) 300 (b) 60 (c) 15 (d) 30
30. 30.Which is closest to 400 × 28? (Round each number first.) (a) 12000 (b) 24000 (c) 1200 (d) 120000
31. 31.Which is closest to 99 + 298 + 196? (a) 700 (b) 800 (c) 600 (d) 500
32. 32.Which is closest to 204 × 18? (Round each number first.) (a) 8000 (b) 400 (c) 40000 (d) 4000
33. 33.Round 81226 to the nearest hundred.
34. 34.Which is closest to 701 + 201 + 103? (a) 1100 (b) 1000 (c) 900 (d) 1200
35. 35.Which is closest to 302 × 78? (Round each number first.) (a) 240000 (b) 2400 (c) 24000 (d) 48000
36. 36.Round 33.44 to one decimal place. =
37. 37.Round 57.76 to one decimal place. =
38. 38.Which is closest to 399 × 58? (Round each number first.) (a) 240000 (b) 2400 (c) 24000 (d) 48000
39. 39.Round 46906 to the nearest hundred.
40. 40.Which is closest to 801 × 51? (Round each number first.) (a) 40000 (b) 4000 (c) 400000 (d) 80000

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