Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 848 · 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 404 × 81? (Round each number first.) (a) 64000 (b) 320000 (c) 3200 (d) 32000
2. 2.Which is closest to 396 × 58? (Round each number first.) (a) 48000 (b) 240000 (c) 24000 (d) 2400
3. 3.Which is closest to 104 + 104 + 397? (a) 500 (b) 700 (c) 800 (d) 600
4. 4.Which is closest to 1605 ÷ 39? (a) 400 (b) 20 (c) 80 (d) 40
5. 5.Which is closest to 105 + 704 + 105? (a) 800 (b) 1100 (c) 1000 (d) 900
6. 6.Which is closest to 796 × 61? (Round each number first.) (a) 48000 (b) 96000 (c) 4800 (d) 480000
7. 7.Which is closest to 497 × 38? (Round each number first.) (a) 2000 (b) 40000 (c) 20000 (d) 200000
8. 8.Which is closest to 603 × 90? (Round each number first.) (a) 54000 (b) 108000 (c) 5400 (d) 540000
9. 9.Which is closest to 300 × 31? (Round each number first.) (a) 18000 (b) 900 (c) 90000 (d) 9000
10. 10.Round 15867 to the nearest ten.
11. 11.Which is closest to 1204 ÷ 21? (a) 600 (b) 60 (c) 120 (d) 30
12. 12.Round 42976 to the nearest thousand.
13. 13.Which is closest to 102 + 802 + 302? (a) 1200 (b) 1300 (c) 1100 (d) 1400
14. 14.Which is closest to 2398 ÷ 41? (a) 120 (b) 60 (c) 30 (d) 600
15. 15.Which is closest to 295 + 95 + 904? (a) 1500 (b) 1400 (c) 1300 (d) 1200
16. 16.Which is closest to 994 ÷ 21? (a) 500 (b) 25 (c) 50 (d) 100
17. 17.Which is closest to 498 × 80? (Round each number first.) (a) 40000 (b) 400000 (c) 4000 (d) 80000
18. 18.Round 43.53 to one decimal place. =
19. 19.Round 79.72 to one decimal place. =
20. 20.Round 9338 to the nearest hundred.
21. 21.Which is closest to 300 × 41? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
22. 22.Round 15.29 to one decimal place. =
23. 23.Which is closest to 202 + 405 + 798? (a) 1400 (b) 1300 (c) 1600 (d) 1500
24. 24.Round 62.62 to one decimal place. =
25. 25.Round 57.06 to one decimal place. =
26. 26.Which is closest to 797 + 301 + 101? (a) 1300 (b) 1200 (c) 1100 (d) 1400
27. 27.Which is closest to 799 + 202 + 404? (a) 1300 (b) 1600 (c) 1500 (d) 1400
28. 28.Which is closest to 1192 ÷ 19? (a) 120 (b) 30 (c) 60 (d) 600
29. 29.Which is closest to 2091 ÷ 31? (a) 70 (b) 700 (c) 140 (d) 35
30. 30.Which is closest to 798 + 300 + 98? (a) 1300 (b) 1100 (c) 1400 (d) 1200
31. 31.Round 61996 to the nearest hundred.
32. 32.Which is closest to 3502 ÷ 51? (a) 140 (b) 700 (c) 35 (d) 70
33. 33.Which is closest to 396 × 40? (Round each number first.) (a) 1600 (b) 32000 (c) 16000 (d) 160000
34. 34.Which is closest to 904 × 61? (Round each number first.) (a) 54000 (b) 5400 (c) 540000 (d) 108000
35. 35.Which is closest to 602 × 20? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
36. 36.Round 29952 to the nearest ten.
37. 37.Which is closest to 798 × 20? (Round each number first.) (a) 16000 (b) 32000 (c) 160000 (d) 1600
38. 38.Which is closest to 602 × 81? (Round each number first.) (a) 480000 (b) 48000 (c) 4800 (d) 96000
39. 39.Round 83770 to the nearest hundred.
40. 40.Which is closest to 405 ÷ 19? (a) 10 (b) 20 (c) 200 (d) 40

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