Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 954 · 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 605 ÷ 19? (a) 60 (b) 30 (c) 15 (d) 300
2. 2.Which is closest to 1201 ÷ 21? (a) 120 (b) 600 (c) 60 (d) 30
3. 3.Which is closest to 201 × 40? (Round each number first.) (a) 800 (b) 16000 (c) 80000 (d) 8000
4. 4.Which is closest to 497 + 801 + 805? (a) 2100 (b) 2000 (c) 2300 (d) 2200
5. 5.Round 91.08 to one decimal place. =
6. 6.Which is closest to 298 × 18? (Round each number first.) (a) 600 (b) 6000 (c) 60000 (d) 12000
7. 7.Which is closest to 596 × 48? (Round each number first.) (a) 60000 (b) 300000 (c) 3000 (d) 30000
8. 8.Which is closest to 894 ÷ 31? (a) 300 (b) 30 (c) 60 (d) 15
9. 9.Round 54126 to the nearest ten.
10. 10.Round 44.89 to one decimal place. =
11. 11.Which is closest to 402 × 48? (Round each number first.) (a) 40000 (b) 20000 (c) 200000 (d) 2000
12. 12.Which is closest to 803 × 50? (Round each number first.) (a) 4000 (b) 400000 (c) 40000 (d) 80000
13. 13.Round 24.91 to one decimal place. =
14. 14.Which is closest to 900 × 51? (Round each number first.) (a) 45000 (b) 450000 (c) 4500 (d) 90000
15. 15.Which is closest to 599 × 62? (Round each number first.) (a) 72000 (b) 36000 (c) 360000 (d) 3600
16. 16.Round 65.73 to one decimal place. =
17. 17.Which is closest to 1806 ÷ 19? (a) 45 (b) 90 (c) 180 (d) 900
18. 18.Which is closest to 596 × 51? (Round each number first.) (a) 60000 (b) 30000 (c) 300000 (d) 3000
19. 19.Round 69913 to the nearest thousand.
20. 20.Round 21143 to the nearest thousand.
21. 21.Which is closest to 598 + 198 + 804? (a) 1600 (b) 1800 (c) 1700 (d) 1500
22. 22.Round 60654 to the nearest ten.
23. 23.Round 59342 to the nearest thousand.
24. 24.Round 98321 to the nearest thousand.
25. 25.Which is closest to 909 ÷ 29? (a) 30 (b) 300 (c) 60 (d) 15
26. 26.Round 27133 to the nearest ten.
27. 27.Which is closest to 202 + 404 + 699? (a) 1500 (b) 1200 (c) 1400 (d) 1300
28. 28.Round 38.93 to one decimal place. =
29. 29.Which is closest to 203 + 195 + 405? (a) 1000 (b) 700 (c) 900 (d) 800
30. 30.Which is closest to 202 × 28? (Round each number first.) (a) 6000 (b) 60000 (c) 12000 (d) 600
31. 31.Which is closest to 404 × 30? (Round each number first.) (a) 12000 (b) 1200 (c) 24000 (d) 120000
32. 32.Which is closest to 199 + 698 + 503? (a) 1300 (b) 1500 (c) 1600 (d) 1400
33. 33.Round 77958 to the nearest ten.
34. 34.Round 47623 to the nearest hundred.
35. 35.Which is closest to 997 ÷ 49? (a) 10 (b) 20 (c) 200 (d) 40
36. 36.Round 65.13 to one decimal place. =
37. 37.Round 71259 to the nearest thousand.
38. 38.Which is closest to 904 × 41? (Round each number first.) (a) 72000 (b) 36000 (c) 3600 (d) 360000
39. 39.Round 92.11 to one decimal place. =
40. 40.Round 18026 to the nearest thousand.

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