Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 519 · 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.Which is closest to 498 × 42? (Round each number first.) (a) 2000 (b) 200000 (c) 20000 (d) 40000
2. 2.Round 33821 to the nearest hundred.
3. 3.Which is closest to 593 ÷ 21? (a) 60 (b) 300 (c) 15 (d) 30
4. 4.Which is closest to 400 + 98 + 97? (a) 700 (b) 600 (c) 800 (d) 500
5. 5.Round 23280 to the nearest hundred.
6. 6.Which is closest to 800 × 88? (Round each number first.) (a) 7200 (b) 720000 (c) 144000 (d) 72000
7. 7.Which is closest to 203 × 30? (Round each number first.) (a) 60000 (b) 600 (c) 12000 (d) 6000
8. 8.Round 88.48 to one decimal place. =
9. 9.Which is closest to 504 + 799 + 799? (a) 2300 (b) 2200 (c) 2000 (d) 2100
10. 10.Round 80.36 to one decimal place. =
11. 11.Which is closest to 498 × 71? (Round each number first.) (a) 3500 (b) 35000 (c) 350000 (d) 70000
12. 12.Round 18.89 to one decimal place. =
13. 13.Round 30836 to the nearest thousand.
14. 14.Which is closest to 404 × 82? (Round each number first.) (a) 320000 (b) 3200 (c) 64000 (d) 32000
15. 15.Which is closest to 593 ÷ 19? (a) 30 (b) 300 (c) 15 (d) 60
16. 16.Round 42.41 to one decimal place. =
17. 17.Which is closest to 303 × 51? (Round each number first.) (a) 150000 (b) 30000 (c) 1500 (d) 15000
18. 18.Which is closest to 800 ÷ 21? (a) 80 (b) 400 (c) 40 (d) 20
19. 19.Which is closest to 295 + 595 + 903? (a) 1900 (b) 1700 (c) 1800 (d) 2000
20. 20.Round 50511 to the nearest thousand.
21. 21.Which is closest to 204 + 805 + 596? (a) 1700 (b) 1800 (c) 1500 (d) 1600
22. 22.Which is closest to 297 × 39? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
23. 23.Round 16.32 to one decimal place. =
24. 24.Round 38870 to the nearest thousand.
25. 25.Round 54448 to the nearest hundred.
26. 26.Round 60.21 to one decimal place. =
27. 27.Round 24.54 to one decimal place. =
28. 28.Round 30311 to the nearest ten.
29. 29.Round 61699 to the nearest ten.
30. 30.Round 13987 to the nearest ten.
31. 31.Which is closest to 800 + 205 + 105? (a) 1000 (b) 1200 (c) 1100 (d) 1300
32. 32.Which is closest to 797 × 92? (Round each number first.) (a) 720000 (b) 144000 (c) 72000 (d) 7200
33. 33.Which is closest to 199 × 60? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
34. 34.Round 59.41 to one decimal place. =
35. 35.Round 55.08 to one decimal place. =
36. 36.Round 54.92 to one decimal place. =
37. 37.Round 10.94 to one decimal place. =
38. 38.Round 26.73 to one decimal place. =
39. 39.Which is closest to 699 × 18? (Round each number first.) (a) 140000 (b) 14000 (c) 1400 (d) 28000
40. 40.Which is closest to 2396 ÷ 29? (a) 80 (b) 40 (c) 160 (d) 800

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