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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 100 · 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 703 × 42? (Round each number first.) (a) 280000 (b) 56000 (c) 2800 (d) 28000
  2. 2.Which is closest to 796 × 19? (Round each number first.) (a) 160000 (b) 32000 (c) 1600 (d) 16000
  3. 3.Round 31831 to the nearest ten.
  4. 4.Round 23.89 to one decimal place. =
  5. 5.Which is closest to 701 + 196 + 497? (a) 1600 (b) 1500 (c) 1400 (d) 1300
  6. 6.Which is closest to 196 + 100 + 296? (a) 800 (b) 600 (c) 700 (d) 500
  7. 7.Round 29234 to the nearest ten.
  8. 8.Which is closest to 4002 ÷ 51? (a) 40 (b) 80 (c) 800 (d) 160
  9. 9.Which is closest to 1000 ÷ 51? (a) 40 (b) 20 (c) 10 (d) 200
  10. 10.Which is closest to 804 + 703 + 799? (a) 2500 (b) 2400 (c) 2300 (d) 2200
  11. 11.Round 14.16 to one decimal place. =
  12. 12.Which is closest to 1407 ÷ 21? (a) 700 (b) 70 (c) 140 (d) 35
  13. 13.Which is closest to 803 ÷ 19? (a) 80 (b) 20 (c) 40 (d) 400
  14. 14.Round 47.84 to one decimal place. =
  15. 15.Which is closest to 905 + 99 + 503? (a) 1700 (b) 1500 (c) 1400 (d) 1600
  16. 16.Round 39399 to the nearest hundred.
  17. 17.Which is closest to 2505 ÷ 51? (a) 25 (b) 100 (c) 50 (d) 500
  18. 18.Round 32814 to the nearest hundred.
  19. 19.Which is closest to 503 + 599 + 395? (a) 1600 (b) 1700 (c) 1500 (d) 1400
  20. 20.Which is closest to 504 + 597 + 301? (a) 1600 (b) 1500 (c) 1300 (d) 1400
  21. 21.Which is closest to 607 ÷ 19? (a) 15 (b) 60 (c) 300 (d) 30
  22. 22.Which is closest to 203 × 59? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  23. 23.Round 28297 to the nearest thousand.
  24. 24.Which is closest to 799 × 28? (Round each number first.) (a) 24000 (b) 240000 (c) 2400 (d) 48000
  25. 25.Which is closest to 593 ÷ 19? (a) 300 (b) 60 (c) 15 (d) 30
  26. 26.Which is closest to 204 × 32? (Round each number first.) (a) 600 (b) 12000 (c) 6000 (d) 60000
  27. 27.Round 62.81 to one decimal place. =
  28. 28.Which is closest to 702 × 62? (Round each number first.) (a) 42000 (b) 4200 (c) 420000 (d) 84000
  29. 29.Round 19.67 to one decimal place. =
  30. 30.Which is closest to 2009 ÷ 49? (a) 80 (b) 40 (c) 20 (d) 400
  31. 31.Round 81.86 to one decimal place. =
  32. 32.Which is closest to 400 + 98 + 197? (a) 600 (b) 800 (c) 700 (d) 900
  33. 33.Round 94.19 to one decimal place. =
  34. 34.Round 7156 to the nearest hundred.
  35. 35.Round 27331 to the nearest thousand.
  36. 36.Which is closest to 1996 ÷ 39? (a) 25 (b) 50 (c) 500 (d) 100
  37. 37.Round 96253 to the nearest ten.
  38. 38.Which is closest to 598 × 68? (Round each number first.) (a) 84000 (b) 420000 (c) 4200 (d) 42000
  39. 39.Round 64928 to the nearest ten.
  40. 40.Round 42.41 to one decimal place. =

Answer key

  1. 28000
  2. 16000
  3. 31830
  4. 23.9
  5. 1400
  6. 600
  7. 29230
  8. 80
  9. 20
  10. 2300
  11. 14.2
  12. 70
  13. 40
  14. 47.8
  15. 1500
  16. 39400
  17. 50
  18. 32800
  19. 1500
  20. 1400
  21. 30
  22. 12000
  23. 28000
  24. 24000
  25. 30
  26. 6000
  27. 62.8
  28. 42000
  29. 19.7
  30. 40
  31. 81.9
  32. 700
  33. 94.2
  34. 7200
  35. 27000
  36. 50
  37. 96250
  38. 42000
  39. 64930
  40. 42.4

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