Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 516 · 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 34.21 to one decimal place. =
2. 2.Which is closest to 797 × 71? (Round each number first.) (a) 112000 (b) 560000 (c) 5600 (d) 56000
3. 3.Which is closest to 301 × 19? (Round each number first.) (a) 60000 (b) 6000 (c) 12000 (d) 600
4. 4.Round 35.88 to one decimal place. =
5. 5.Which is closest to 304 × 41? (Round each number first.) (a) 120000 (b) 12000 (c) 24000 (d) 1200
6. 6.Which is closest to 304 + 97 + 197? (a) 800 (b) 500 (c) 700 (d) 600
7. 7.Round 26.54 to one decimal place. =
8. 8.Round 44.67 to one decimal place. =
9. 9.Round 12.29 to one decimal place. =
10. 10.Which is closest to 497 × 49? (Round each number first.) (a) 50000 (b) 25000 (c) 2500 (d) 250000
11. 11.Which is closest to 903 × 42? (Round each number first.) (a) 360000 (b) 3600 (c) 72000 (d) 36000
12. 12.Which is closest to 1595 ÷ 39? (a) 80 (b) 20 (c) 400 (d) 40
13. 13.Round 17.54 to one decimal place. =
14. 14.Which is closest to 503 × 88? (Round each number first.) (a) 45000 (b) 4500 (c) 90000 (d) 450000
15. 15.Round 82902 to the nearest hundred.
16. 16.Which is closest to 498 × 30? (Round each number first.) (a) 15000 (b) 30000 (c) 1500 (d) 150000
17. 17.Which is closest to 599 × 22? (Round each number first.) (a) 24000 (b) 12000 (c) 1200 (d) 120000
18. 18.Which is closest to 596 + 603 + 503? (a) 1600 (b) 1800 (c) 1700 (d) 1900
19. 19.Round 83898 to the nearest ten.
20. 20.Which is closest to 595 + 100 + 105? (a) 1000 (b) 800 (c) 900 (d) 700
21. 21.Which is closest to 501 × 28? (Round each number first.) (a) 15000 (b) 1500 (c) 30000 (d) 150000
22. 22.Which is closest to 199 × 30? (Round each number first.) (a) 600 (b) 6000 (c) 12000 (d) 60000
23. 23.Which is closest to 902 + 99 + 105? (a) 1000 (b) 1300 (c) 1200 (d) 1100
24. 24.Which is closest to 1792 ÷ 31? (a) 600 (b) 30 (c) 120 (d) 60
25. 25.Round 11311 to the nearest ten.
26. 26.Which is closest to 403 × 70? (Round each number first.) (a) 28000 (b) 2800 (c) 280000 (d) 56000
27. 27.Which is closest to 2794 ÷ 39? (a) 700 (b) 70 (c) 35 (d) 140
28. 28.Which is closest to 900 × 51? (Round each number first.) (a) 450000 (b) 90000 (c) 45000 (d) 4500
29. 29.Round 43.11 to one decimal place. =
30. 30.Which is closest to 398 × 39? (Round each number first.) (a) 1600 (b) 160000 (c) 16000 (d) 32000
31. 31.Which is closest to 698 × 20? (Round each number first.) (a) 14000 (b) 28000 (c) 1400 (d) 140000
32. 32.Which is closest to 1202 ÷ 29? (a) 40 (b) 80 (c) 20 (d) 400
33. 33.Which is closest to 1394 ÷ 19? (a) 70 (b) 140 (c) 35 (d) 700
34. 34.Which is closest to 696 + 899 + 698? (a) 2300 (b) 2500 (c) 2400 (d) 2200
35. 35.Which is closest to 201 × 88? (Round each number first.) (a) 1800 (b) 36000 (c) 18000 (d) 180000
36. 36.Which is closest to 395 ÷ 19? (a) 200 (b) 40 (c) 10 (d) 20
37. 37.Which is closest to 497 + 798 + 601? (a) 1800 (b) 2100 (c) 1900 (d) 2000
38. 38.Which is closest to 607 ÷ 29? (a) 200 (b) 40 (c) 20 (d) 10
39. 39.Which is closest to 599 × 81? (Round each number first.) (a) 480000 (b) 4800 (c) 96000 (d) 48000
40. 40.Which is closest to 700 × 71? (Round each number first.) (a) 490000 (b) 4900 (c) 49000 (d) 98000

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