Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 586 · 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 51484 to the nearest ten.
2. 2.Which is closest to 2708 ÷ 29? (a) 45 (b) 180 (c) 90 (d) 900
3. 3.Which is closest to 705 + 203 + 295? (a) 1200 (b) 1400 (c) 1300 (d) 1100
4. 4.Which is closest to 297 + 704 + 201? (a) 1200 (b) 1100 (c) 1400 (d) 1300
5. 5.Which is closest to 295 + 899 + 498? (a) 1800 (b) 1600 (c) 1700 (d) 1900
6. 6.Which is closest to 697 × 91? (Round each number first.) (a) 126000 (b) 630000 (c) 6300 (d) 63000
7. 7.Which is closest to 901 × 18? (Round each number first.) (a) 18000 (b) 1800 (c) 36000 (d) 180000
8. 8.Which is closest to 991 ÷ 19? (a) 500 (b) 25 (c) 50 (d) 100
9. 9.Round 27777 to the nearest ten.
10. 10.Which is closest to 597 × 28? (Round each number first.) (a) 18000 (b) 1800 (c) 180000 (d) 36000
11. 11.Which is closest to 301 + 197 + 502? (a) 900 (b) 1100 (c) 1000 (d) 1200
12. 12.Which is closest to 497 + 698 + 498? (a) 1900 (b) 1800 (c) 1600 (d) 1700
13. 13.Round 65.61 to one decimal place. =
14. 14.Round 11.48 to one decimal place. =
15. 15.Which is closest to 402 × 81? (Round each number first.) (a) 3200 (b) 32000 (c) 64000 (d) 320000
16. 16.Which is closest to 603 × 70? (Round each number first.) (a) 84000 (b) 4200 (c) 42000 (d) 420000
17. 17.Which is closest to 504 × 72? (Round each number first.) (a) 350000 (b) 35000 (c) 3500 (d) 70000
18. 18.Which is closest to 503 × 52? (Round each number first.) (a) 50000 (b) 25000 (c) 2500 (d) 250000
19. 19.Round 51.48 to one decimal place. =
20. 20.Which is closest to 792 ÷ 39? (a) 20 (b) 40 (c) 10 (d) 200
21. 21.Round 33035 to the nearest thousand.
22. 22.Which is closest to 799 × 22? (Round each number first.) (a) 160000 (b) 16000 (c) 1600 (d) 32000
23. 23.Round 53670 to the nearest thousand.
24. 24.Round 86441 to the nearest thousand.
25. 25.Which is closest to 396 + 96 + 500? (a) 1200 (b) 1000 (c) 900 (d) 1100
26. 26.Which is closest to 398 + 895 + 796? (a) 2200 (b) 2300 (c) 2100 (d) 2000
27. 27.Which is closest to 297 × 29? (Round each number first.) (a) 90000 (b) 18000 (c) 900 (d) 9000
28. 28.Which is closest to 196 × 51? (Round each number first.) (a) 10000 (b) 1000 (c) 20000 (d) 100000
29. 29.Round 48787 to the nearest ten.
30. 30.Which is closest to 802 ÷ 39? (a) 200 (b) 20 (c) 40 (d) 10
31. 31.Which is closest to 299 × 38? (Round each number first.) (a) 24000 (b) 12000 (c) 120000 (d) 1200
32. 32.Which is closest to 298 × 90? (Round each number first.) (a) 54000 (b) 27000 (c) 2700 (d) 270000
33. 33.Round 15857 to the nearest thousand.
34. 34.Which is closest to 699 + 295 + 697? (a) 1800 (b) 1600 (c) 1700 (d) 1900
35. 35.Which is closest to 1605 ÷ 39? (a) 80 (b) 400 (c) 40 (d) 20
36. 36.Round 29.39 to one decimal place. =
37. 37.Round 80.31 to one decimal place. =
38. 38.Round 53.36 to one decimal place. =
39. 39.Which is closest to 702 × 62? (Round each number first.) (a) 42000 (b) 4200 (c) 84000 (d) 420000
40. 40.Round 11998 to the nearest ten.

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