Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 399 · 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 399 × 30? (Round each number first.) (a) 12000 (b) 1200 (c) 120000 (d) 24000
2. 2.Round 62.42 to one decimal place. =
3. 3.Which is closest to 2394 ÷ 39? (a) 60 (b) 30 (c) 120 (d) 600
4. 4.Which is closest to 497 × 19? (Round each number first.) (a) 20000 (b) 1000 (c) 10000 (d) 100000
5. 5.Which is closest to 201 × 58? (Round each number first.) (a) 12000 (b) 24000 (c) 120000 (d) 1200
6. 6.Which is closest to 303 + 398 + 898? (a) 1800 (b) 1500 (c) 1600 (d) 1700
7. 7.Which is closest to 104 + 102 + 95? (a) 500 (b) 400 (c) 200 (d) 300
8. 8.Round 34672 to the nearest thousand.
9. 9.Round 39.06 to one decimal place. =
10. 10.Which is closest to 204 × 40? (Round each number first.) (a) 80000 (b) 800 (c) 16000 (d) 8000
11. 11.Which is closest to 204 × 48? (Round each number first.) (a) 10000 (b) 1000 (c) 100000 (d) 20000
12. 12.Which is closest to 197 × 70? (Round each number first.) (a) 14000 (b) 28000 (c) 1400 (d) 140000
13. 13.Which is closest to 503 + 495 + 499? (a) 1700 (b) 1600 (c) 1400 (d) 1500
14. 14.Which is closest to 1602 ÷ 21? (a) 80 (b) 800 (c) 40 (d) 160
15. 15.Which is closest to 304 × 30? (Round each number first.) (a) 900 (b) 9000 (c) 18000 (d) 90000
16. 16.Which is closest to 197 × 51? (Round each number first.) (a) 100000 (b) 20000 (c) 10000 (d) 1000
17. 17.Round 24.52 to one decimal place. =
18. 18.Round 39240 to the nearest hundred.
19. 19.Which is closest to 803 ÷ 41? (a) 40 (b) 10 (c) 20 (d) 200
20. 20.Which is closest to 2695 ÷ 31? (a) 90 (b) 45 (c) 900 (d) 180
21. 21.Which is closest to 402 × 29? (Round each number first.) (a) 120000 (b) 24000 (c) 12000 (d) 1200
22. 22.Which is closest to 798 × 29? (Round each number first.) (a) 2400 (b) 48000 (c) 240000 (d) 24000
23. 23.Which is closest to 95 + 298 + 695? (a) 1200 (b) 1000 (c) 1300 (d) 1100
24. 24.Round 1977 to the nearest thousand.
25. 25.Which is closest to 200 × 81? (Round each number first.) (a) 160000 (b) 1600 (c) 32000 (d) 16000
26. 26.Round 14.86 to one decimal place. =
27. 27.Which is closest to 504 + 801 + 97? (a) 1300 (b) 1500 (c) 1400 (d) 1600
28. 28.Which is closest to 900 × 62? (Round each number first.) (a) 5400 (b) 108000 (c) 540000 (d) 54000
29. 29.Which is closest to 403 × 80? (Round each number first.) (a) 3200 (b) 64000 (c) 32000 (d) 320000
30. 30.Which is closest to 202 × 21? (Round each number first.) (a) 8000 (b) 40000 (c) 400 (d) 4000
31. 31.Round 24.91 to one decimal place. =
32. 32.Which is closest to 298 × 28? (Round each number first.) (a) 900 (b) 9000 (c) 18000 (d) 90000
33. 33.Which is closest to 800 × 58? (Round each number first.) (a) 48000 (b) 4800 (c) 480000 (d) 96000
34. 34.Which is closest to 598 + 304 + 202? (a) 1200 (b) 1000 (c) 1300 (d) 1100
35. 35.Round 88.18 to one decimal place. =
36. 36.Which is closest to 3502 ÷ 49? (a) 140 (b) 35 (c) 70 (d) 700
37. 37.Which is closest to 704 + 503 + 400? (a) 1500 (b) 1700 (c) 1600 (d) 1800
38. 38.Which is closest to 503 + 198 + 305? (a) 900 (b) 1200 (c) 1100 (d) 1000
39. 39.Round 53.17 to one decimal place. =
40. 40.Round 18.56 to one decimal place. =

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