Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 106 · 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 94.52 to one decimal place. =
2. 2.Which is closest to 296 + 103 + 695? (a) 1300 (b) 1000 (c) 1100 (d) 1200
3. 3.Which is closest to 101 + 301 + 201? (a) 700 (b) 500 (c) 600 (d) 800
4. 4.Which is closest to 300 × 51? (Round each number first.) (a) 1500 (b) 150000 (c) 30000 (d) 15000
5. 5.Which is closest to 602 ÷ 29? (a) 40 (b) 10 (c) 200 (d) 20
6. 6.Which is closest to 799 × 81? (Round each number first.) (a) 64000 (b) 640000 (c) 6400 (d) 128000
7. 7.Round 37194 to the nearest thousand.
8. 8.Round 13.91 to one decimal place. =
9. 9.Which is closest to 498 + 896 + 100? (a) 1400 (b) 1600 (c) 1700 (d) 1500
10. 10.Round 19332 to the nearest hundred.
11. 11.Which is closest to 501 × 42? (Round each number first.) (a) 40000 (b) 20000 (c) 200000 (d) 2000
12. 12.Which is closest to 195 + 195 + 900? (a) 1200 (b) 1400 (c) 1300 (d) 1500
13. 13.Round 59482 to the nearest thousand.
14. 14.Which is closest to 804 × 52? (Round each number first.) (a) 4000 (b) 40000 (c) 80000 (d) 400000
15. 15.Which is closest to 796 × 41? (Round each number first.) (a) 64000 (b) 320000 (c) 3200 (d) 32000
16. 16.Round 83303 to the nearest hundred.
17. 17.Round 18.17 to one decimal place. =
18. 18.Which is closest to 104 + 598 + 496? (a) 1300 (b) 1100 (c) 1200 (d) 1400
19. 19.Which is closest to 102 + 597 + 599? (a) 1400 (b) 1500 (c) 1200 (d) 1300
20. 20.Round 90113 to the nearest ten.
21. 21.Which is closest to 205 + 201 + 895? (a) 1400 (b) 1300 (c) 1200 (d) 1500
22. 22.Round 58158 to the nearest thousand.
23. 23.Which is closest to 3200 ÷ 41? (a) 40 (b) 800 (c) 80 (d) 160
24. 24.Round 21647 to the nearest thousand.
25. 25.Which is closest to 598 × 90? (Round each number first.) (a) 54000 (b) 540000 (c) 5400 (d) 108000
26. 26.Which is closest to 504 × 40? (Round each number first.) (a) 40000 (b) 20000 (c) 200000 (d) 2000
27. 27.Round 17481 to the nearest ten.
28. 28.Round 28657 to the nearest thousand.
29. 29.Round 82022 to the nearest thousand.
30. 30.Which is closest to 297 × 31? (Round each number first.) (a) 9000 (b) 18000 (c) 900 (d) 90000
31. 31.Round 72864 to the nearest hundred.
32. 32.Which is closest to 501 + 904 + 103? (a) 1400 (b) 1600 (c) 1700 (d) 1500
33. 33.Which is closest to 900 × 31? (Round each number first.) (a) 270000 (b) 27000 (c) 2700 (d) 54000
34. 34.Round 67156 to the nearest ten.
35. 35.Round 39.93 to one decimal place. =
36. 36.Which is closest to 298 × 18? (Round each number first.) (a) 60000 (b) 600 (c) 12000 (d) 6000
37. 37.Which is closest to 503 × 82? (Round each number first.) (a) 4000 (b) 400000 (c) 80000 (d) 40000
38. 38.Which is closest to 993 ÷ 19? (a) 50 (b) 100 (c) 500 (d) 25
39. 39.Which is closest to 503 × 21? (Round each number first.) (a) 1000 (b) 100000 (c) 10000 (d) 20000
40. 40.Which is closest to 704 × 38? (Round each number first.) (a) 2800 (b) 56000 (c) 28000 (d) 280000

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