Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 344 · 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 81.88 to one decimal place. =
2. 2.Round 10.63 to one decimal place. =
3. 3.Which is closest to 905 + 605 + 501? (a) 2100 (b) 2200 (c) 2000 (d) 1900
4. 4.Which is closest to 301 + 701 + 96? (a) 1200 (b) 1000 (c) 1300 (d) 1100
5. 5.Which is closest to 199 × 20? (Round each number first.) (a) 40000 (b) 8000 (c) 400 (d) 4000
6. 6.Which is closest to 1794 ÷ 31? (a) 30 (b) 120 (c) 60 (d) 600
7. 7.Which is closest to 2407 ÷ 31? (a) 40 (b) 80 (c) 800 (d) 160
8. 8.Round 22.29 to one decimal place. =
9. 9.Which is closest to 799 × 81? (Round each number first.) (a) 64000 (b) 128000 (c) 640000 (d) 6400
10. 10.Round 15101 to the nearest ten.
11. 11.Which is closest to 501 × 18? (Round each number first.) (a) 100000 (b) 1000 (c) 10000 (d) 20000
12. 12.Round 44.78 to one decimal place. =
13. 13.Round 50483 to the nearest ten.
14. 14.Which is closest to 198 × 79? (Round each number first.) (a) 16000 (b) 1600 (c) 160000 (d) 32000
15. 15.Round 92192 to the nearest ten.
16. 16.Round 31.12 to one decimal place. =
17. 17.Round 51.36 to one decimal place. =
18. 18.Round 63578 to the nearest hundred.
19. 19.Which is closest to 1595 ÷ 21? (a) 800 (b) 80 (c) 160 (d) 40
20. 20.Round 47089 to the nearest hundred.
21. 21.Round 48354 to the nearest hundred.
22. 22.Which is closest to 203 × 71? (Round each number first.) (a) 14000 (b) 140000 (c) 1400 (d) 28000
23. 23.Round 9715 to the nearest thousand.
24. 24.Which is closest to 805 ÷ 19? (a) 80 (b) 400 (c) 40 (d) 20
25. 25.Which is closest to 596 + 399 + 402? (a) 1400 (b) 1500 (c) 1300 (d) 1600
26. 26.Which is closest to 1009 ÷ 19? (a) 100 (b) 25 (c) 500 (d) 50
27. 27.Which is closest to 297 × 69? (Round each number first.) (a) 42000 (b) 21000 (c) 210000 (d) 2100
28. 28.Which is closest to 3604 ÷ 41? (a) 90 (b) 180 (c) 45 (d) 900
29. 29.Which is closest to 796 × 88? (Round each number first.) (a) 7200 (b) 144000 (c) 72000 (d) 720000
30. 30.Round 60647 to the nearest ten.
31. 31.Which is closest to 695 + 296 + 603? (a) 1800 (b) 1500 (c) 1600 (d) 1700
32. 32.Round 11.53 to one decimal place. =
33. 33.Round 46078 to the nearest hundred.
34. 34.Which is closest to 897 × 49? (Round each number first.) (a) 90000 (b) 450000 (c) 4500 (d) 45000
35. 35.Which is closest to 897 + 703 + 803? (a) 2400 (b) 2500 (c) 2300 (d) 2600
36. 36.Round 37482 to the nearest thousand.
37. 37.Which is closest to 2794 ÷ 39? (a) 70 (b) 35 (c) 140 (d) 700
38. 38.Which is closest to 898 × 18? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
39. 39.Which is closest to 801 × 61? (Round each number first.) (a) 480000 (b) 48000 (c) 96000 (d) 4800
40. 40.Round 45.12 to one decimal place. =

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