Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 550 · 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 26555 to the nearest thousand.
2. 2.Which is closest to 697 × 22? (Round each number first.) (a) 28000 (b) 140000 (c) 14000 (d) 1400
3. 3.Which is closest to 198 × 69? (Round each number first.) (a) 28000 (b) 140000 (c) 14000 (d) 1400
4. 4.Which is closest to 2405 ÷ 39? (a) 600 (b) 120 (c) 30 (d) 60
5. 5.Round 29631 to the nearest thousand.
6. 6.Which is closest to 402 × 48? (Round each number first.) (a) 200000 (b) 40000 (c) 20000 (d) 2000
7. 7.Round 84.37 to one decimal place. =
8. 8.Which is closest to 196 × 51? (Round each number first.) (a) 100000 (b) 1000 (c) 10000 (d) 20000
9. 9.Which is closest to 503 × 50? (Round each number first.) (a) 50000 (b) 250000 (c) 2500 (d) 25000
10. 10.Which is closest to 404 × 22? (Round each number first.) (a) 16000 (b) 80000 (c) 8000 (d) 800
11. 11.Which is closest to 1805 ÷ 21? (a) 180 (b) 900 (c) 90 (d) 45
12. 12.Which is closest to 504 × 92? (Round each number first.) (a) 90000 (b) 45000 (c) 450000 (d) 4500
13. 13.Which is closest to 597 × 29? (Round each number first.) (a) 180000 (b) 36000 (c) 1800 (d) 18000
14. 14.Round 83.69 to one decimal place. =
15. 15.Which is closest to 805 + 799 + 796? (a) 2500 (b) 2600 (c) 2400 (d) 2300
16. 16.Round 18.86 to one decimal place. =
17. 17.Which is closest to 98 + 496 + 202? (a) 1000 (b) 800 (c) 700 (d) 900
18. 18.Which is closest to 900 + 897 + 800? (a) 2800 (b) 2500 (c) 2600 (d) 2700
19. 19.Which is closest to 596 × 49? (Round each number first.) (a) 30000 (b) 300000 (c) 60000 (d) 3000
20. 20.Round 60933 to the nearest thousand.
21. 21.Round 81.17 to one decimal place. =
22. 22.Round 35.58 to one decimal place. =
23. 23.Which is closest to 801 × 39? (Round each number first.) (a) 320000 (b) 3200 (c) 64000 (d) 32000
24. 24.Which is closest to 3609 ÷ 39? (a) 45 (b) 900 (c) 180 (d) 90
25. 25.Which is closest to 201 × 39? (Round each number first.) (a) 16000 (b) 80000 (c) 8000 (d) 800
26. 26.Which is closest to 703 × 58? (Round each number first.) (a) 42000 (b) 84000 (c) 420000 (d) 4200
27. 27.Which is closest to 297 + 197 + 605? (a) 1100 (b) 1000 (c) 1200 (d) 1300
28. 28.Which is closest to 800 + 101 + 497? (a) 1600 (b) 1300 (c) 1400 (d) 1500
29. 29.Which is closest to 96 + 101 + 203? (a) 500 (b) 300 (c) 400 (d) 600
30. 30.Which is closest to 1404 ÷ 21? (a) 700 (b) 35 (c) 70 (d) 140
31. 31.Which is closest to 503 × 58? (Round each number first.) (a) 60000 (b) 30000 (c) 3000 (d) 300000
32. 32.Which is closest to 296 + 196 + 399? (a) 800 (b) 1100 (c) 1000 (d) 900
33. 33.Which is closest to 3991 ÷ 49? (a) 40 (b) 160 (c) 80 (d) 800
34. 34.Which is closest to 798 × 68? (Round each number first.) (a) 560000 (b) 5600 (c) 56000 (d) 112000
35. 35.Which is closest to 199 × 60? (Round each number first.) (a) 1200 (b) 12000 (c) 120000 (d) 24000
36. 36.Round 96.56 to one decimal place. =
37. 37.Which is closest to 3499 ÷ 49? (a) 140 (b) 700 (c) 35 (d) 70
38. 38.Which is closest to 304 + 200 + 505? (a) 1200 (b) 900 (c) 1100 (d) 1000
39. 39.Round 95.86 to one decimal place. =
40. 40.Round 8844 to the nearest ten.

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