Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 621 · 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 58.87 to one decimal place. =
2. 2.Round 24.79 to one decimal place. =
3. 3.Round 46.54 to one decimal place. =
4. 4.Which is closest to 898 × 19? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000
5. 5.Round 92.72 to one decimal place. =
6. 6.Round 63310 to the nearest hundred.
7. 7.Which is closest to 1009 ÷ 19? (a) 500 (b) 100 (c) 50 (d) 25
8. 8.Which is closest to 604 + 600 + 505? (a) 1700 (b) 1900 (c) 1600 (d) 1800
9. 9.Which is closest to 599 × 19? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
10. 10.Round 34111 to the nearest ten.
11. 11.Round 24.73 to one decimal place. =
12. 12.Which is closest to 198 + 801 + 601? (a) 1500 (b) 1800 (c) 1600 (d) 1700
13. 13.Which is closest to 801 × 79? (Round each number first.) (a) 64000 (b) 640000 (c) 128000 (d) 6400
14. 14.Which is closest to 502 × 32? (Round each number first.) (a) 15000 (b) 30000 (c) 150000 (d) 1500
15. 15.Which is closest to 296 × 32? (Round each number first.) (a) 18000 (b) 9000 (c) 90000 (d) 900
16. 16.Round 27640 to the nearest hundred.
17. 17.Which is closest to 3209 ÷ 41? (a) 80 (b) 160 (c) 40 (d) 800
18. 18.Round 6892 to the nearest ten.
19. 19.Which is closest to 802 + 101 + 297? (a) 1100 (b) 1300 (c) 1200 (d) 1400
20. 20.Which is closest to 702 + 703 + 900? (a) 2200 (b) 2400 (c) 2300 (d) 2500
21. 21.Round 86331 to the nearest ten.
22. 22.Which is closest to 503 × 61? (Round each number first.) (a) 3000 (b) 60000 (c) 30000 (d) 300000
23. 23.Round 39872 to the nearest hundred.
24. 24.Round 23524 to the nearest hundred.
25. 25.Which is closest to 798 × 78? (Round each number first.) (a) 128000 (b) 64000 (c) 640000 (d) 6400
26. 26.Round 25.68 to one decimal place. =
27. 27.Which is closest to 800 + 402 + 498? (a) 1800 (b) 1600 (c) 1700 (d) 1900
28. 28.Round 64.22 to one decimal place. =
29. 29.Round 74.34 to one decimal place. =
30. 30.Round 58.79 to one decimal place. =
31. 31.Which is closest to 498 + 697 + 502? (a) 1800 (b) 1700 (c) 1600 (d) 1900
32. 32.Round 30428 to the nearest ten.
33. 33.Round 49.19 to one decimal place. =
34. 34.Round 15.62 to one decimal place. =
35. 35.Round 91.09 to one decimal place. =
36. 36.Round 19843 to the nearest thousand.
37. 37.Which is closest to 504 × 91? (Round each number first.) (a) 450000 (b) 90000 (c) 4500 (d) 45000
38. 38.Which is closest to 701 × 39? (Round each number first.) (a) 280000 (b) 28000 (c) 56000 (d) 2800
39. 39.Which is closest to 199 × 39? (Round each number first.) (a) 80000 (b) 16000 (c) 800 (d) 8000
40. 40.Which is closest to 798 × 91? (Round each number first.) (a) 7200 (b) 144000 (c) 72000 (d) 720000

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