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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 322 · 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.Which is closest to 903 × 70? (Round each number first.) (a) 126000 (b) 63000 (c) 6300 (d) 630000
  2. 2.Which is closest to 202 × 19? (Round each number first.) (a) 400 (b) 40000 (c) 4000 (d) 8000
  3. 3.Round 68052 to the nearest ten.
  4. 4.Round 38.57 to one decimal place. =
  5. 5.Which is closest to 297 + 602 + 704? (a) 1600 (b) 1700 (c) 1800 (d) 1500
  6. 6.Round 25652 to the nearest thousand.
  7. 7.Which is closest to 604 × 78? (Round each number first.) (a) 480000 (b) 96000 (c) 48000 (d) 4800
  8. 8.Round 21.58 to one decimal place. =
  9. 9.Which is closest to 803 ÷ 19? (a) 80 (b) 20 (c) 40 (d) 400
  10. 10.Round 5825 to the nearest thousand.
  11. 11.Which is closest to 296 × 92? (Round each number first.) (a) 2700 (b) 54000 (c) 27000 (d) 270000
  12. 12.Which is closest to 304 × 20? (Round each number first.) (a) 6000 (b) 12000 (c) 600 (d) 60000
  13. 13.Which is closest to 299 × 89? (Round each number first.) (a) 27000 (b) 2700 (c) 54000 (d) 270000
  14. 14.Round 34.46 to one decimal place. =
  15. 15.Round 90.71 to one decimal place. =
  16. 16.Which is closest to 204 + 500 + 595? (a) 1200 (b) 1300 (c) 1400 (d) 1500
  17. 17.Which is closest to 98 + 903 + 500? (a) 1600 (b) 1400 (c) 1700 (d) 1500
  18. 18.Round 64.62 to one decimal place. =
  19. 19.Which is closest to 600 + 104 + 898? (a) 1800 (b) 1500 (c) 1700 (d) 1600
  20. 20.Round 75976 to the nearest hundred.
  21. 21.Which is closest to 801 × 31? (Round each number first.) (a) 48000 (b) 240000 (c) 2400 (d) 24000
  22. 22.Which is closest to 1502 ÷ 51? (a) 15 (b) 30 (c) 60 (d) 300
  23. 23.Which is closest to 796 ÷ 19? (a) 20 (b) 40 (c) 400 (d) 80
  24. 24.Round 91886 to the nearest ten.
  25. 25.Which is closest to 4006 ÷ 49? (a) 800 (b) 40 (c) 80 (d) 160
  26. 26.Which is closest to 804 × 29? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
  27. 27.Which is closest to 803 × 59? (Round each number first.) (a) 96000 (b) 48000 (c) 4800 (d) 480000
  28. 28.Which is closest to 600 + 703 + 203? (a) 1400 (b) 1600 (c) 1700 (d) 1500
  29. 29.Round 50.41 to one decimal place. =
  30. 30.Round 58516 to the nearest thousand.
  31. 31.Which is closest to 1594 ÷ 21? (a) 160 (b) 800 (c) 40 (d) 80
  32. 32.Round 36.18 to one decimal place. =
  33. 33.Round 84.89 to one decimal place. =
  34. 34.Round 24489 to the nearest hundred.
  35. 35.Round 63.92 to one decimal place. =
  36. 36.Which is closest to 1509 ÷ 51? (a) 30 (b) 15 (c) 300 (d) 60
  37. 37.Which is closest to 397 + 497 + 199? (a) 1200 (b) 1100 (c) 1000 (d) 1300
  38. 38.Round 3909 to the nearest ten.
  39. 39.Round 16193 to the nearest thousand.
  40. 40.Round 94372 to the nearest thousand.

Answer key

  1. 63000
  2. 4000
  3. 68050
  4. 38.6
  5. 1600
  6. 26000
  7. 48000
  8. 21.6
  9. 40
  10. 6000
  11. 27000
  12. 6000
  13. 27000
  14. 34.5
  15. 90.7
  16. 1300
  17. 1500
  18. 64.6
  19. 1600
  20. 76000
  21. 24000
  22. 30
  23. 40
  24. 91890
  25. 80
  26. 24000
  27. 48000
  28. 1500
  29. 50.4
  30. 59000
  31. 80
  32. 36.2
  33. 84.9
  34. 24500
  35. 63.9
  36. 30
  37. 1100
  38. 3910
  39. 16000
  40. 94000

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