Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 780 · 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 98 + 97 + 104? (a) 500 (b) 400 (c) 200 (d) 300
2. 2.Which is closest to 1796 ÷ 19? (a) 90 (b) 180 (c) 900 (d) 45
3. 3.Which is closest to 797 + 401 + 96? (a) 1400 (b) 1300 (c) 1500 (d) 1200
4. 4.Which is closest to 402 × 32? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
5. 5.Round 57304 to the nearest thousand.
6. 6.Which is closest to 905 + 603 + 302? (a) 1700 (b) 2000 (c) 1800 (d) 1900
7. 7.Which is closest to 196 × 88? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
8. 8.Which is closest to 197 × 70? (Round each number first.) (a) 28000 (b) 1400 (c) 14000 (d) 140000
9. 9.Round 72.33 to one decimal place. =
10. 10.Which is closest to 96 + 604 + 699? (a) 1400 (b) 1500 (c) 1600 (d) 1300
11. 11.Which is closest to 1209 ÷ 29? (a) 20 (b) 400 (c) 80 (d) 40
12. 12.Which is closest to 603 × 22? (Round each number first.) (a) 1200 (b) 24000 (c) 120000 (d) 12000
13. 13.Round 78.21 to one decimal place. =
14. 14.Which is closest to 703 × 58? (Round each number first.) (a) 42000 (b) 84000 (c) 4200 (d) 420000
15. 15.Round 70016 to the nearest thousand.
16. 16.Which is closest to 2007 ÷ 51? (a) 400 (b) 80 (c) 40 (d) 20
17. 17.Which is closest to 799 × 81? (Round each number first.) (a) 640000 (b) 6400 (c) 128000 (d) 64000
18. 18.Which is closest to 296 × 32? (Round each number first.) (a) 9000 (b) 90000 (c) 18000 (d) 900
19. 19.Round 94397 to the nearest thousand.
20. 20.Round 27.34 to one decimal place. =
21. 21.Which is closest to 400 × 71? (Round each number first.) (a) 56000 (b) 28000 (c) 280000 (d) 2800
22. 22.Which is closest to 503 × 18? (Round each number first.) (a) 100000 (b) 20000 (c) 1000 (d) 10000
23. 23.Which is closest to 498 + 499 + 796? (a) 1700 (b) 1900 (c) 1800 (d) 2000
24. 24.Round 52.31 to one decimal place. =
25. 25.Which is closest to 702 × 60? (Round each number first.) (a) 420000 (b) 84000 (c) 4200 (d) 42000
26. 26.Which is closest to 197 + 201 + 603? (a) 1200 (b) 1100 (c) 900 (d) 1000
27. 27.Which is closest to 201 + 595 + 604? (a) 1600 (b) 1500 (c) 1400 (d) 1300
28. 28.Which is closest to 900 × 91? (Round each number first.) (a) 810000 (b) 162000 (c) 81000 (d) 8100
29. 29.Round 25626 to the nearest ten.
30. 30.Which is closest to 199 + 396 + 105? (a) 600 (b) 900 (c) 800 (d) 700
31. 31.Which is closest to 803 ÷ 21? (a) 80 (b) 20 (c) 40 (d) 400
32. 32.Which is closest to 601 × 91? (Round each number first.) (a) 540000 (b) 108000 (c) 5400 (d) 54000
33. 33.Which is closest to 497 × 61? (Round each number first.) (a) 3000 (b) 30000 (c) 300000 (d) 60000
34. 34.Round 97.66 to one decimal place. =
35. 35.Which is closest to 3000 ÷ 49? (a) 60 (b) 30 (c) 600 (d) 120
36. 36.Which is closest to 904 + 199 + 405? (a) 1700 (b) 1600 (c) 1400 (d) 1500
37. 37.Which is closest to 503 + 297 + 601? (a) 1400 (b) 1300 (c) 1500 (d) 1600
38. 38.Which is closest to 397 + 295 + 804? (a) 1600 (b) 1400 (c) 1500 (d) 1700
39. 39.Round 76.27 to one decimal place. =
40. 40.Which is closest to 504 + 603 + 504? (a) 1600 (b) 1500 (c) 1800 (d) 1700

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