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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 376 · 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 82.74 to one decimal place. =
  2. 2.Which is closest to 1993 ÷ 39? (a) 25 (b) 100 (c) 500 (d) 50
  3. 3.Which is closest to 2492 ÷ 51? (a) 100 (b) 500 (c) 25 (d) 50
  4. 4.Which is closest to 499 + 598 + 700? (a) 1800 (b) 1900 (c) 1700 (d) 2000
  5. 5.Which is closest to 2698 ÷ 31? (a) 45 (b) 90 (c) 180 (d) 900
  6. 6.Which is closest to 97 + 298 + 699? (a) 1200 (b) 1100 (c) 1000 (d) 1300
  7. 7.Which is closest to 2493 ÷ 51? (a) 100 (b) 50 (c) 25 (d) 500
  8. 8.Round 17.94 to one decimal place. =
  9. 9.Which is closest to 902 + 696 + 300? (a) 2100 (b) 1900 (c) 1800 (d) 2000
  10. 10.Which is closest to 697 × 29? (Round each number first.) (a) 2100 (b) 210000 (c) 42000 (d) 21000
  11. 11.Which is closest to 204 × 32? (Round each number first.) (a) 60000 (b) 6000 (c) 12000 (d) 600
  12. 12.Which is closest to 697 × 92? (Round each number first.) (a) 126000 (b) 630000 (c) 6300 (d) 63000
  13. 13.Which is closest to 404 × 79? (Round each number first.) (a) 320000 (b) 3200 (c) 32000 (d) 64000
  14. 14.Which is closest to 202 × 20? (Round each number first.) (a) 400 (b) 4000 (c) 8000 (d) 40000
  15. 15.Which is closest to 1793 ÷ 21? (a) 180 (b) 90 (c) 45 (d) 900
  16. 16.Round 56752 to the nearest thousand.
  17. 17.Which is closest to 197 + 899 + 900? (a) 2100 (b) 1900 (c) 2200 (d) 2000
  18. 18.Which is closest to 1497 ÷ 49? (a) 60 (b) 300 (c) 30 (d) 15
  19. 19.Round 77.07 to one decimal place. =
  20. 20.Round 15.69 to one decimal place. =
  21. 21.Round 77.54 to one decimal place. =
  22. 22.Round 78558 to the nearest hundred.
  23. 23.Round 57198 to the nearest ten.
  24. 24.Round 28806 to the nearest ten.
  25. 25.Which is closest to 303 × 92? (Round each number first.) (a) 2700 (b) 54000 (c) 270000 (d) 27000
  26. 26.Which is closest to 1793 ÷ 19? (a) 90 (b) 900 (c) 180 (d) 45
  27. 27.Round 45627 to the nearest hundred.
  28. 28.Which is closest to 1205 ÷ 19? (a) 30 (b) 600 (c) 120 (d) 60
  29. 29.Round 27.11 to one decimal place. =
  30. 30.Which is closest to 697 × 30? (Round each number first.) (a) 2100 (b) 42000 (c) 210000 (d) 21000
  31. 31.Which is closest to 97 + 802 + 801? (a) 1700 (b) 1900 (c) 1600 (d) 1800
  32. 32.Which is closest to 599 ÷ 29? (a) 40 (b) 200 (c) 10 (d) 20
  33. 33.Round 10704 to the nearest ten.
  34. 34.Round 80.52 to one decimal place. =
  35. 35.Round 90.61 to one decimal place. =
  36. 36.Round 59313 to the nearest hundred.
  37. 37.Round 68.59 to one decimal place. =
  38. 38.Which is closest to 302 × 71? (Round each number first.) (a) 42000 (b) 21000 (c) 210000 (d) 2100
  39. 39.Round 56.87 to one decimal place. =
  40. 40.Which is closest to 203 × 61? (Round each number first.) (a) 24000 (b) 120000 (c) 12000 (d) 1200

Answer key

  1. 82.7
  2. 50
  3. 50
  4. 1800
  5. 90
  6. 1100
  7. 50
  8. 17.9
  9. 1900
  10. 21000
  11. 6000
  12. 63000
  13. 32000
  14. 4000
  15. 90
  16. 57000
  17. 2000
  18. 30
  19. 77.1
  20. 15.7
  21. 77.5
  22. 78600
  23. 57200
  24. 28810
  25. 27000
  26. 90
  27. 45600
  28. 60
  29. 27.1
  30. 21000
  31. 1700
  32. 20
  33. 10700
  34. 80.5
  35. 90.6
  36. 59300
  37. 68.6
  38. 21000
  39. 56.9
  40. 12000

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