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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 517 · 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 31.54 to one decimal place. =
  2. 2.Which is closest to 396 + 197 + 405? (a) 1200 (b) 1100 (c) 1000 (d) 900
  3. 3.Round 20.22 to one decimal place. =
  4. 4.Which is closest to 302 × 91? (Round each number first.) (a) 54000 (b) 27000 (c) 270000 (d) 2700
  5. 5.Which is closest to 898 + 96 + 398? (a) 1500 (b) 1400 (c) 1300 (d) 1600
  6. 6.Round 97.34 to one decimal place. =
  7. 7.Which is closest to 1196 ÷ 31? (a) 20 (b) 40 (c) 400 (d) 80
  8. 8.Which is closest to 3004 ÷ 51? (a) 120 (b) 60 (c) 600 (d) 30
  9. 9.Which is closest to 198 × 70? (Round each number first.) (a) 28000 (b) 140000 (c) 14000 (d) 1400
  10. 10.Which is closest to 599 ÷ 19? (a) 15 (b) 30 (c) 60 (d) 300
  11. 11.Round 12.82 to one decimal place. =
  12. 12.Round 56043 to the nearest thousand.
  13. 13.Round 77764 to the nearest ten.
  14. 14.Round 45538 to the nearest thousand.
  15. 15.Round 45298 to the nearest ten.
  16. 16.Which is closest to 396 × 21? (Round each number first.) (a) 80000 (b) 800 (c) 8000 (d) 16000
  17. 17.Round 26150 to the nearest thousand.
  18. 18.Round 28.84 to one decimal place. =
  19. 19.Round 43.42 to one decimal place. =
  20. 20.Which is closest to 698 × 40? (Round each number first.) (a) 28000 (b) 2800 (c) 56000 (d) 280000
  21. 21.Which is closest to 2092 ÷ 31? (a) 700 (b) 140 (c) 70 (d) 35
  22. 22.Round 28.19 to one decimal place. =
  23. 23.Round 41.87 to one decimal place. =
  24. 24.Which is closest to 598 × 88? (Round each number first.) (a) 5400 (b) 540000 (c) 54000 (d) 108000
  25. 25.Which is closest to 604 + 704 + 101? (a) 1600 (b) 1400 (c) 1300 (d) 1500
  26. 26.Which is closest to 2400 ÷ 29? (a) 800 (b) 160 (c) 80 (d) 40
  27. 27.Which is closest to 3506 ÷ 49? (a) 35 (b) 70 (c) 700 (d) 140
  28. 28.Round 96.57 to one decimal place. =
  29. 29.Round 25037 to the nearest ten.
  30. 30.Round 54527 to the nearest hundred.
  31. 31.Which is closest to 204 × 72? (Round each number first.) (a) 1400 (b) 140000 (c) 28000 (d) 14000
  32. 32.Which is closest to 599 ÷ 31? (a) 10 (b) 200 (c) 40 (d) 20
  33. 33.Round 11208 to the nearest hundred.
  34. 34.Which is closest to 203 + 205 + 801? (a) 1100 (b) 1400 (c) 1300 (d) 1200
  35. 35.Which is closest to 1805 ÷ 31? (a) 30 (b) 120 (c) 600 (d) 60
  36. 36.Which is closest to 601 + 495 + 504? (a) 1800 (b) 1500 (c) 1600 (d) 1700
  37. 37.Round 30.39 to one decimal place. =
  38. 38.Which is closest to 902 + 504 + 596? (a) 2100 (b) 2000 (c) 2200 (d) 1900
  39. 39.Which is closest to 702 + 505 + 98? (a) 1200 (b) 1500 (c) 1300 (d) 1400
  40. 40.Which is closest to 3607 ÷ 39? (a) 180 (b) 45 (c) 90 (d) 900

Answer key

  1. 31.5
  2. 1000
  3. 20.2
  4. 27000
  5. 1400
  6. 97.3
  7. 40
  8. 60
  9. 14000
  10. 30
  11. 12.8
  12. 56000
  13. 77760
  14. 46000
  15. 45300
  16. 8000
  17. 26000
  18. 28.8
  19. 43.4
  20. 28000
  21. 70
  22. 28.2
  23. 41.9
  24. 54000
  25. 1400
  26. 80
  27. 70
  28. 96.6
  29. 25040
  30. 54500
  31. 14000
  32. 20
  33. 11200
  34. 1200
  35. 60
  36. 1600
  37. 30.4
  38. 2000
  39. 1300
  40. 90

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