Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 102 · 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 17.16 to one decimal place. =
2. 2.Which is closest to 803 × 30? (Round each number first.) (a) 48000 (b) 24000 (c) 240000 (d) 2400
3. 3.Which is closest to 796 × 52? (Round each number first.) (a) 400000 (b) 40000 (c) 4000 (d) 80000
4. 4.Which is closest to 302 + 398 + 199? (a) 1000 (b) 800 (c) 1100 (d) 900
5. 5.Round 24.46 to one decimal place. =
6. 6.Which is closest to 2004 ÷ 49? (a) 80 (b) 40 (c) 400 (d) 20
7. 7.Which is closest to 499 × 32? (Round each number first.) (a) 150000 (b) 15000 (c) 1500 (d) 30000
8. 8.Which is closest to 798 × 68? (Round each number first.) (a) 5600 (b) 112000 (c) 560000 (d) 56000
9. 9.Round 78314 to the nearest hundred.
10. 10.Which is closest to 795 + 599 + 703? (a) 2000 (b) 2300 (c) 2100 (d) 2200
11. 11.Which is closest to 496 × 28? (Round each number first.) (a) 150000 (b) 15000 (c) 1500 (d) 30000
12. 12.Which is closest to 198 × 49? (Round each number first.) (a) 10000 (b) 20000 (c) 1000 (d) 100000
13. 13.Round 47.49 to one decimal place. =
14. 14.Which is closest to 1607 ÷ 39? (a) 20 (b) 400 (c) 80 (d) 40
15. 15.Which is closest to 3600 ÷ 39? (a) 900 (b) 180 (c) 90 (d) 45
16. 16.Which is closest to 3492 ÷ 49? (a) 70 (b) 700 (c) 140 (d) 35
17. 17.Round 69957 to the nearest ten.
18. 18.Which is closest to 3209 ÷ 39? (a) 160 (b) 40 (c) 80 (d) 800
19. 19.Which is closest to 702 × 29? (Round each number first.) (a) 2100 (b) 210000 (c) 42000 (d) 21000
20. 20.Round 39124 to the nearest hundred.
21. 21.Which is closest to 203 + 204 + 103? (a) 700 (b) 400 (c) 600 (d) 500
22. 22.Which is closest to 504 × 48? (Round each number first.) (a) 25000 (b) 50000 (c) 2500 (d) 250000
23. 23.Which is closest to 601 × 29? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000
24. 24.Round 68.53 to one decimal place. =
25. 25.Which is closest to 1996 ÷ 41? (a) 100 (b) 25 (c) 50 (d) 500
26. 26.Which is closest to 898 × 19? (Round each number first.) (a) 18000 (b) 180000 (c) 1800 (d) 36000
27. 27.Which is closest to 2705 ÷ 31? (a) 45 (b) 90 (c) 180 (d) 900
28. 28.Round 24.21 to one decimal place. =
29. 29.Round 43100 to the nearest thousand.
30. 30.Which is closest to 204 × 28? (Round each number first.) (a) 60000 (b) 12000 (c) 6000 (d) 600
31. 31.Which is closest to 399 × 81? (Round each number first.) (a) 32000 (b) 64000 (c) 320000 (d) 3200
32. 32.Which is closest to 404 × 18? (Round each number first.) (a) 800 (b) 8000 (c) 80000 (d) 16000
33. 33.Which is closest to 301 × 21? (Round each number first.) (a) 60000 (b) 6000 (c) 12000 (d) 600
34. 34.Which is closest to 898 × 92? (Round each number first.) (a) 8100 (b) 162000 (c) 810000 (d) 81000
35. 35.Which is closest to 102 + 804 + 195? (a) 1200 (b) 1300 (c) 1100 (d) 1000
36. 36.Which is closest to 591 ÷ 21? (a) 30 (b) 60 (c) 15 (d) 300
37. 37.Which is closest to 797 + 299 + 305? (a) 1500 (b) 1300 (c) 1600 (d) 1400
38. 38.Round 94.87 to one decimal place. =
39. 39.Round 71.22 to one decimal place. =
40. 40.Which is closest to 803 ÷ 41? (a) 200 (b) 10 (c) 20 (d) 40

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