Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 541 · 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 50719 to the nearest thousand.
2. 2.Round 30.37 to one decimal place. =
3. 3.Which is closest to 602 × 19? (Round each number first.) (a) 1200 (b) 24000 (c) 120000 (d) 12000
4. 4.Which is closest to 3991 ÷ 51? (a) 160 (b) 40 (c) 80 (d) 800
5. 5.Which is closest to 2699 ÷ 29? (a) 180 (b) 900 (c) 45 (d) 90
6. 6.Which is closest to 2698 ÷ 29? (a) 900 (b) 180 (c) 45 (d) 90
7. 7.Which is closest to 599 × 31? (Round each number first.) (a) 18000 (b) 36000 (c) 180000 (d) 1800
8. 8.Which is closest to 596 + 297 + 899? (a) 2000 (b) 1900 (c) 1800 (d) 1700
9. 9.Round 80.22 to one decimal place. =
10. 10.Round 30.94 to one decimal place. =
11. 11.Round 54.84 to one decimal place. =
12. 12.Which is closest to 403 × 32? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
13. 13.Round 28.66 to one decimal place. =
14. 14.Which is closest to 198 × 91? (Round each number first.) (a) 36000 (b) 1800 (c) 180000 (d) 18000
15. 15.Which is closest to 2505 ÷ 49? (a) 50 (b) 100 (c) 500 (d) 25
16. 16.Which is closest to 399 × 62? (Round each number first.) (a) 48000 (b) 24000 (c) 240000 (d) 2400
17. 17.Which is closest to 402 + 405 + 899? (a) 1700 (b) 1800 (c) 1900 (d) 1600
18. 18.Round 79179 to the nearest ten.
19. 19.Which is closest to 798 × 18? (Round each number first.) (a) 1600 (b) 16000 (c) 32000 (d) 160000
20. 20.Round 74.23 to one decimal place. =
21. 21.Which is closest to 201 × 41? (Round each number first.) (a) 800 (b) 16000 (c) 8000 (d) 80000
22. 22.Which is closest to 603 + 95 + 198? (a) 1000 (b) 800 (c) 900 (d) 1100
23. 23.Which is closest to 496 × 79? (Round each number first.) (a) 40000 (b) 80000 (c) 400000 (d) 4000
24. 24.Which is closest to 901 + 402 + 904? (a) 2200 (b) 2400 (c) 2100 (d) 2300
25. 25.Which is closest to 797 × 42? (Round each number first.) (a) 320000 (b) 64000 (c) 3200 (d) 32000
26. 26.Which is closest to 295 + 204 + 396? (a) 800 (b) 900 (c) 1000 (d) 1100
27. 27.Which is closest to 703 × 58? (Round each number first.) (a) 42000 (b) 4200 (c) 84000 (d) 420000
28. 28.Round 63.26 to one decimal place. =
29. 29.Round 18.42 to one decimal place. =
30. 30.Which is closest to 797 × 69? (Round each number first.) (a) 5600 (b) 56000 (c) 112000 (d) 560000
31. 31.Which is closest to 1605 ÷ 21? (a) 40 (b) 160 (c) 800 (d) 80
32. 32.Which is closest to 404 × 61? (Round each number first.) (a) 2400 (b) 48000 (c) 24000 (d) 240000
33. 33.Which is closest to 904 + 400 + 497? (a) 2000 (b) 1700 (c) 1900 (d) 1800
34. 34.Round 89465 to the nearest hundred.
35. 35.Which is closest to 896 + 602 + 103? (a) 1700 (b) 1600 (c) 1800 (d) 1500
36. 36.Which is closest to 797 × 31? (Round each number first.) (a) 2400 (b) 24000 (c) 240000 (d) 48000
37. 37.Which is closest to 597 ÷ 21? (a) 15 (b) 60 (c) 300 (d) 30
38. 38.Which is closest to 398 + 100 + 199? (a) 800 (b) 600 (c) 900 (d) 700
39. 39.Round 31.69 to one decimal place. =
40. 40.Which is closest to 197 × 61? (Round each number first.) (a) 24000 (b) 120000 (c) 12000 (d) 1200

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