Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 11 · 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 83.32 to one decimal place. =
2. 2.Which is closest to 101 + 299 + 798? (a) 1300 (b) 1100 (c) 1400 (d) 1200
3. 3.Round 59738 to the nearest hundred.
4. 4.Which is closest to 395 + 604 + 702? (a) 1800 (b) 1900 (c) 1700 (d) 1600
5. 5.Which is closest to 599 × 92? (Round each number first.) (a) 540000 (b) 54000 (c) 5400 (d) 108000
6. 6.Round 17.21 to one decimal place. =
7. 7.Which is closest to 497 + 696 + 797? (a) 2100 (b) 1900 (c) 2000 (d) 2200
8. 8.Which is closest to 804 × 50? (Round each number first.) (a) 40000 (b) 400000 (c) 80000 (d) 4000
9. 9.Round 79.89 to one decimal place. =
10. 10.Which is closest to 200 + 499 + 895? (a) 1800 (b) 1700 (c) 1500 (d) 1600
11. 11.Round 21939 to the nearest hundred.
12. 12.Which is closest to 602 × 30? (Round each number first.) (a) 1800 (b) 18000 (c) 180000 (d) 36000
13. 13.Which is closest to 204 × 19? (Round each number first.) (a) 4000 (b) 400 (c) 8000 (d) 40000
14. 14.Which is closest to 798 ÷ 19? (a) 80 (b) 20 (c) 40 (d) 400
15. 15.Round 81.79 to one decimal place. =
16. 16.Round 52225 to the nearest hundred.
17. 17.Which is closest to 197 × 50? (Round each number first.) (a) 20000 (b) 1000 (c) 10000 (d) 100000
18. 18.Round 75904 to the nearest thousand.
19. 19.Round 34.17 to one decimal place. =
20. 20.Which is closest to 804 × 21? (Round each number first.) (a) 1600 (b) 32000 (c) 16000 (d) 160000
21. 21.Which is closest to 999 ÷ 49? (a) 40 (b) 10 (c) 20 (d) 200
22. 22.Which is closest to 201 × 39? (Round each number first.) (a) 8000 (b) 16000 (c) 80000 (d) 800
23. 23.Which is closest to 202 × 42? (Round each number first.) (a) 16000 (b) 8000 (c) 80000 (d) 800
24. 24.Round 8056 to the nearest ten.
25. 25.Which is closest to 197 × 38? (Round each number first.) (a) 8000 (b) 16000 (c) 80000 (d) 800
26. 26.Which is closest to 895 + 299 + 395? (a) 1500 (b) 1700 (c) 1600 (d) 1800
27. 27.Which is closest to 296 × 49? (Round each number first.) (a) 150000 (b) 30000 (c) 1500 (d) 15000
28. 28.Round 37228 to the nearest ten.
29. 29.Which is closest to 700 × 72? (Round each number first.) (a) 98000 (b) 49000 (c) 490000 (d) 4900
30. 30.Which is closest to 604 + 604 + 796? (a) 2100 (b) 1900 (c) 2000 (d) 2200
31. 31.Which is closest to 300 + 795 + 605? (a) 1800 (b) 1700 (c) 1600 (d) 1900
32. 32.Which is closest to 1801 ÷ 31? (a) 30 (b) 120 (c) 600 (d) 60
33. 33.Which is closest to 98 + 295 + 196? (a) 700 (b) 500 (c) 600 (d) 800
34. 34.Round 56.17 to one decimal place. =
35. 35.Which is closest to 896 × 50? (Round each number first.) (a) 450000 (b) 45000 (c) 90000 (d) 4500
36. 36.Which is closest to 903 × 28? (Round each number first.) (a) 2700 (b) 54000 (c) 27000 (d) 270000
37. 37.Which is closest to 404 × 42? (Round each number first.) (a) 16000 (b) 1600 (c) 160000 (d) 32000
38. 38.Round 38.26 to one decimal place. =
39. 39.Which is closest to 501 × 29? (Round each number first.) (a) 150000 (b) 1500 (c) 30000 (d) 15000
40. 40.Which is closest to 1196 ÷ 19? (a) 30 (b) 60 (c) 600 (d) 120

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