Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 320 · 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 30.39 to one decimal place. =
2. 2.Which is closest to 204 × 78? (Round each number first.) (a) 160000 (b) 1600 (c) 16000 (d) 32000
3. 3.Which is closest to 396 × 39? (Round each number first.) (a) 32000 (b) 160000 (c) 1600 (d) 16000
4. 4.Round 10608 to the nearest ten.
5. 5.Which is closest to 398 × 49? (Round each number first.) (a) 2000 (b) 200000 (c) 40000 (d) 20000
6. 6.Round 92.44 to one decimal place. =
7. 7.Which is closest to 898 × 20? (Round each number first.) (a) 1800 (b) 18000 (c) 36000 (d) 180000
8. 8.Which is closest to 397 + 500 + 399? (a) 1300 (b) 1500 (c) 1200 (d) 1400
9. 9.Round 80647 to the nearest ten.
10. 10.Which is closest to 799 × 68? (Round each number first.) (a) 560000 (b) 56000 (c) 112000 (d) 5600
11. 11.Which is closest to 395 + 899 + 803? (a) 2100 (b) 2300 (c) 2000 (d) 2200
12. 12.Which is closest to 697 × 91? (Round each number first.) (a) 6300 (b) 63000 (c) 630000 (d) 126000
13. 13.Which is closest to 299 × 49? (Round each number first.) (a) 1500 (b) 30000 (c) 150000 (d) 15000
14. 14.Round 25.39 to one decimal place. =
15. 15.Round 23616 to the nearest ten.
16. 16.Which is closest to 804 + 195 + 398? (a) 1600 (b) 1400 (c) 1500 (d) 1300
17. 17.Which is closest to 299 + 97 + 903? (a) 1500 (b) 1400 (c) 1300 (d) 1200
18. 18.Round 16.42 to one decimal place. =
19. 19.Round 73033 to the nearest thousand.
20. 20.Which is closest to 501 + 203 + 197? (a) 1100 (b) 900 (c) 800 (d) 1000
21. 21.Which is closest to 196 × 71? (Round each number first.) (a) 140000 (b) 1400 (c) 14000 (d) 28000
22. 22.Which is closest to 99 + 796 + 99? (a) 900 (b) 1200 (c) 1100 (d) 1000
23. 23.Round 80.19 to one decimal place. =
24. 24.Which is closest to 1994 ÷ 41? (a) 500 (b) 100 (c) 25 (d) 50
25. 25.Which is closest to 1609 ÷ 41? (a) 20 (b) 40 (c) 400 (d) 80
26. 26.Round 35.82 to one decimal place. =
27. 27.Which is closest to 595 + 697 + 396? (a) 1700 (b) 1900 (c) 1800 (d) 1600
28. 28.Round 9259 to the nearest ten.
29. 29.Round 36908 to the nearest ten.
30. 30.Round 49759 to the nearest hundred.
31. 31.Which is closest to 697 + 305 + 496? (a) 1400 (b) 1500 (c) 1700 (d) 1600
32. 32.Round 94108 to the nearest thousand.
33. 33.Which is closest to 496 × 92? (Round each number first.) (a) 90000 (b) 450000 (c) 45000 (d) 4500
34. 34.Which is closest to 502 + 601 + 596? (a) 1900 (b) 1600 (c) 1700 (d) 1800
35. 35.Which is closest to 397 × 52? (Round each number first.) (a) 20000 (b) 200000 (c) 2000 (d) 40000
36. 36.Which is closest to 398 × 38? (Round each number first.) (a) 32000 (b) 1600 (c) 16000 (d) 160000
37. 37.Which is closest to 496 × 62? (Round each number first.) (a) 300000 (b) 60000 (c) 30000 (d) 3000
38. 38.Which is closest to 196 + 201 + 803? (a) 1100 (b) 1300 (c) 1400 (d) 1200
39. 39.Round 50443 to the nearest thousand.
40. 40.Which is closest to 1196 ÷ 19? (a) 60 (b) 120 (c) 30 (d) 600

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