Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 685 · 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 800 + 902 + 102? (a) 2000 (b) 1900 (c) 1700 (d) 1800
2. 2.Which is closest to 395 + 104 + 896? (a) 1500 (b) 1300 (c) 1400 (d) 1600
3. 3.Round 73.58 to one decimal place. =
4. 4.Round 40.88 to one decimal place. =
5. 5.Which is closest to 499 + 601 + 197? (a) 1200 (b) 1300 (c) 1500 (d) 1400
6. 6.Which is closest to 96 + 499 + 799? (a) 1600 (b) 1500 (c) 1300 (d) 1400
7. 7.Which is closest to 598 × 21? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
8. 8.Which is closest to 2106 ÷ 29? (a) 35 (b) 140 (c) 700 (d) 70
9. 9.Round 20.19 to one decimal place. =
10. 10.Round 20.53 to one decimal place. =
11. 11.Round 49.73 to one decimal place. =
12. 12.Which is closest to 797 × 59? (Round each number first.) (a) 4800 (b) 480000 (c) 96000 (d) 48000
13. 13.Which is closest to 1991 ÷ 49? (a) 400 (b) 80 (c) 20 (d) 40
14. 14.Round 84.31 to one decimal place. =
15. 15.Which is closest to 201 × 81? (Round each number first.) (a) 16000 (b) 160000 (c) 32000 (d) 1600
16. 16.Round 68190 to the nearest thousand.
17. 17.Which is closest to 597 × 49? (Round each number first.) (a) 3000 (b) 60000 (c) 300000 (d) 30000
18. 18.Round 56534 to the nearest ten.
19. 19.Round 2675 to the nearest thousand.
20. 20.Round 98956 to the nearest ten.
21. 21.Round 15.29 to one decimal place. =
22. 22.Round 19.09 to one decimal place. =
23. 23.Which is closest to 401 + 502 + 100? (a) 1100 (b) 1000 (c) 1200 (d) 900
24. 24.Which is closest to 2701 ÷ 31? (a) 90 (b) 180 (c) 45 (d) 900
25. 25.Round 79.76 to one decimal place. =
26. 26.Which is closest to 196 × 22? (Round each number first.) (a) 40000 (b) 4000 (c) 8000 (d) 400
27. 27.Which is closest to 504 × 80? (Round each number first.) (a) 80000 (b) 4000 (c) 400000 (d) 40000
28. 28.Round 27270 to the nearest thousand.
29. 29.Round 29.11 to one decimal place. =
30. 30.Round 72.68 to one decimal place. =
31. 31.Which is closest to 804 ÷ 19? (a) 400 (b) 80 (c) 40 (d) 20
32. 32.Which is closest to 4009 ÷ 49? (a) 80 (b) 800 (c) 160 (d) 40
33. 33.Which is closest to 604 × 90? (Round each number first.) (a) 54000 (b) 5400 (c) 108000 (d) 540000
34. 34.Which is closest to 296 × 89? (Round each number first.) (a) 54000 (b) 27000 (c) 270000 (d) 2700
35. 35.Round 70606 to the nearest ten.
36. 36.Which is closest to 1209 ÷ 21? (a) 60 (b) 600 (c) 120 (d) 30
37. 37.Which is closest to 904 + 397 + 696? (a) 2100 (b) 1900 (c) 2200 (d) 2000
38. 38.Round 86371 to the nearest thousand.
39. 39.Round 19811 to the nearest thousand.
40. 40.Which is closest to 597 × 22? (Round each number first.) (a) 12000 (b) 24000 (c) 120000 (d) 1200

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