Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 633 · 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 197 × 70? (Round each number first.) (a) 1400 (b) 28000 (c) 14000 (d) 140000
2. 2.Which is closest to 2406 ÷ 29? (a) 800 (b) 80 (c) 160 (d) 40
3. 3.Round 74.41 to one decimal place. =
4. 4.Round 56.44 to one decimal place. =
5. 5.Round 54.42 to one decimal place. =
6. 6.Which is closest to 196 × 51? (Round each number first.) (a) 1000 (b) 100000 (c) 10000 (d) 20000
7. 7.Which is closest to 598 + 505 + 496? (a) 1600 (b) 1700 (c) 1500 (d) 1800
8. 8.Which is closest to 904 + 299 + 97? (a) 1300 (b) 1400 (c) 1500 (d) 1200
9. 9.Which is closest to 502 + 598 + 897? (a) 2100 (b) 1900 (c) 2200 (d) 2000
10. 10.Which is closest to 503 × 81? (Round each number first.) (a) 80000 (b) 40000 (c) 400000 (d) 4000
11. 11.Which is closest to 202 + 104 + 199? (a) 400 (b) 700 (c) 600 (d) 500
12. 12.Which is closest to 96 + 805 + 201? (a) 1000 (b) 1200 (c) 1300 (d) 1100
13. 13.Which is closest to 796 × 31? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
14. 14.Round 63714 to the nearest ten.
15. 15.Which is closest to 297 × 69? (Round each number first.) (a) 42000 (b) 21000 (c) 210000 (d) 2100
16. 16.Which is closest to 1194 ÷ 31? (a) 20 (b) 400 (c) 40 (d) 80
17. 17.Round 32.49 to one decimal place. =
18. 18.Which is closest to 299 × 50? (Round each number first.) (a) 1500 (b) 30000 (c) 15000 (d) 150000
19. 19.Which is closest to 298 × 21? (Round each number first.) (a) 6000 (b) 600 (c) 12000 (d) 60000
20. 20.Round 66.63 to one decimal place. =
21. 21.Round 69664 to the nearest thousand.
22. 22.Which is closest to 899 × 60? (Round each number first.) (a) 54000 (b) 5400 (c) 108000 (d) 540000
23. 23.Which is closest to 799 + 695 + 105? (a) 1700 (b) 1800 (c) 1600 (d) 1500
24. 24.Which is closest to 3499 ÷ 49? (a) 140 (b) 35 (c) 700 (d) 70
25. 25.Which is closest to 799 × 61? (Round each number first.) (a) 96000 (b) 48000 (c) 480000 (d) 4800
26. 26.Which is closest to 904 ÷ 29? (a) 60 (b) 300 (c) 30 (d) 15
27. 27.Which is closest to 300 + 501 + 697? (a) 1500 (b) 1400 (c) 1600 (d) 1700
28. 28.Which is closest to 702 × 88? (Round each number first.) (a) 126000 (b) 6300 (c) 63000 (d) 630000
29. 29.Which is closest to 703 × 18? (Round each number first.) (a) 1400 (b) 28000 (c) 140000 (d) 14000
30. 30.Which is closest to 203 + 497 + 96? (a) 800 (b) 900 (c) 1000 (d) 700
31. 31.Which is closest to 496 + 903 + 898? (a) 2300 (b) 2200 (c) 2400 (d) 2500
32. 32.Which is closest to 299 + 503 + 96? (a) 1100 (b) 1000 (c) 900 (d) 800
33. 33.Which is closest to 802 × 30? (Round each number first.) (a) 48000 (b) 24000 (c) 240000 (d) 2400
34. 34.Which is closest to 804 + 200 + 295? (a) 1500 (b) 1400 (c) 1200 (d) 1300
35. 35.Which is closest to 598 + 896 + 497? (a) 2000 (b) 2200 (c) 2100 (d) 1900
36. 36.Round 14.79 to one decimal place. =
37. 37.Which is closest to 604 × 89? (Round each number first.) (a) 540000 (b) 108000 (c) 5400 (d) 54000
38. 38.Which is closest to 401 + 701 + 96? (a) 1100 (b) 1200 (c) 1300 (d) 1400
39. 39.Round 53.52 to one decimal place. =
40. 40.Which is closest to 1605 ÷ 39? (a) 20 (b) 80 (c) 40 (d) 400

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