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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 635 · 40 questions
TalentJR

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.

NameDateTime takenScore ___ / 40
  1. 1.Round 63.84 to one decimal place. =
  2. 2.Which is closest to 196 × 59? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  3. 3.Which is closest to 2397 ÷ 39? (a) 600 (b) 30 (c) 120 (d) 60
  4. 4.Round 93039 to the nearest thousand.
  5. 5.Which is closest to 499 × 60? (Round each number first.) (a) 300000 (b) 60000 (c) 30000 (d) 3000
  6. 6.Round 71508 to the nearest ten.
  7. 7.Which is closest to 205 + 699 + 299? (a) 1200 (b) 1400 (c) 1100 (d) 1300
  8. 8.Round 10084 to the nearest hundred.
  9. 9.Which is closest to 794 ÷ 21? (a) 400 (b) 20 (c) 80 (d) 40
  10. 10.Which is closest to 395 + 502 + 199? (a) 1200 (b) 1300 (c) 1100 (d) 1000
  11. 11.Which is closest to 797 + 399 + 98? (a) 1300 (b) 1400 (c) 1500 (d) 1200
  12. 12.Which is closest to 805 + 401 + 897? (a) 2300 (b) 2000 (c) 2100 (d) 2200
  13. 13.Which is closest to 796 × 69? (Round each number first.) (a) 560000 (b) 112000 (c) 5600 (d) 56000
  14. 14.Round 79018 to the nearest ten.
  15. 15.Round 21.91 to one decimal place. =
  16. 16.Round 87727 to the nearest ten.
  17. 17.Which is closest to 996 ÷ 51? (a) 40 (b) 10 (c) 20 (d) 200
  18. 18.Round 61115 to the nearest thousand.
  19. 19.Which is closest to 2696 ÷ 31? (a) 900 (b) 180 (c) 45 (d) 90
  20. 20.Round 11261 to the nearest thousand.
  21. 21.Which is closest to 198 + 297 + 502? (a) 1000 (b) 900 (c) 1200 (d) 1100
  22. 22.Which is closest to 899 × 31? (Round each number first.) (a) 54000 (b) 270000 (c) 2700 (d) 27000
  23. 23.Round 41.84 to one decimal place. =
  24. 24.Which is closest to 401 × 72? (Round each number first.) (a) 56000 (b) 2800 (c) 280000 (d) 28000
  25. 25.Which is closest to 897 × 88? (Round each number first.) (a) 81000 (b) 8100 (c) 162000 (d) 810000
  26. 26.Which is closest to 597 ÷ 21? (a) 300 (b) 30 (c) 15 (d) 60
  27. 27.Which is closest to 1196 ÷ 21? (a) 120 (b) 600 (c) 30 (d) 60
  28. 28.Round 53.17 to one decimal place. =
  29. 29.Round 33.88 to one decimal place. =
  30. 30.Which is closest to 201 × 32? (Round each number first.) (a) 60000 (b) 600 (c) 12000 (d) 6000
  31. 31.Which is closest to 604 × 80? (Round each number first.) (a) 4800 (b) 96000 (c) 480000 (d) 48000
  32. 32.Round 11.77 to one decimal place. =
  33. 33.Round 26152 to the nearest ten.
  34. 34.Round 21.68 to one decimal place. =
  35. 35.Which is closest to 396 × 32? (Round each number first.) (a) 24000 (b) 12000 (c) 120000 (d) 1200
  36. 36.Round 88.71 to one decimal place. =
  37. 37.Which is closest to 904 × 32? (Round each number first.) (a) 54000 (b) 270000 (c) 2700 (d) 27000
  38. 38.Which is closest to 905 + 702 + 95? (a) 1600 (b) 1900 (c) 1700 (d) 1800
  39. 39.Round 67586 to the nearest thousand.
  40. 40.Which is closest to 297 × 22? (Round each number first.) (a) 60000 (b) 6000 (c) 12000 (d) 600

Answer key

  1. 63.8
  2. 12000
  3. 60
  4. 93000
  5. 30000
  6. 71510
  7. 1200
  8. 10100
  9. 40
  10. 1100
  11. 1300
  12. 2100
  13. 56000
  14. 79020
  15. 21.9
  16. 87730
  17. 20
  18. 61000
  19. 90
  20. 11000
  21. 1000
  22. 27000
  23. 41.8
  24. 28000
  25. 81000
  26. 30
  27. 60
  28. 53.2
  29. 33.9
  30. 6000
  31. 48000
  32. 11.8
  33. 26150
  34. 21.7
  35. 12000
  36. 88.7
  37. 27000
  38. 1700
  39. 68000
  40. 6000

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