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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 215 · 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 897 + 900 + 100? (a) 2100 (b) 2000 (c) 1900 (d) 1800
  2. 2.Round 19675 to the nearest thousand.
  3. 3.Round 68967 to the nearest ten.
  4. 4.Round 68.23 to one decimal place. =
  5. 5.Round 79.42 to one decimal place. =
  6. 6.Which is closest to 698 × 49? (Round each number first.) (a) 350000 (b) 35000 (c) 70000 (d) 3500
  7. 7.Round 26761 to the nearest hundred.
  8. 8.Which is closest to 1996 ÷ 41? (a) 50 (b) 25 (c) 100 (d) 500
  9. 9.Which is closest to 395 + 705 + 603? (a) 1700 (b) 1600 (c) 1900 (d) 1800
  10. 10.Round 27995 to the nearest hundred.
  11. 11.Round 29509 to the nearest ten.
  12. 12.Which is closest to 196 × 28? (Round each number first.) (a) 600 (b) 12000 (c) 60000 (d) 6000
  13. 13.Round 50019 to the nearest ten.
  14. 14.Which is closest to 798 × 32? (Round each number first.) (a) 2400 (b) 24000 (c) 48000 (d) 240000
  15. 15.Which is closest to 302 × 91? (Round each number first.) (a) 54000 (b) 270000 (c) 27000 (d) 2700
  16. 16.Which is closest to 3599 ÷ 41? (a) 90 (b) 45 (c) 180 (d) 900
  17. 17.Which is closest to 2002 ÷ 41? (a) 500 (b) 25 (c) 100 (d) 50
  18. 18.Round 51.26 to one decimal place. =
  19. 19.Which is closest to 599 ÷ 21? (a) 15 (b) 300 (c) 30 (d) 60
  20. 20.Round 65.91 to one decimal place. =
  21. 21.Round 62705 to the nearest hundred.
  22. 22.Which is closest to 2005 ÷ 49? (a) 20 (b) 400 (c) 40 (d) 80
  23. 23.Round 60406 to the nearest ten.
  24. 24.Which is closest to 803 × 19? (Round each number first.) (a) 160000 (b) 32000 (c) 16000 (d) 1600
  25. 25.Which is closest to 791 ÷ 41? (a) 40 (b) 10 (c) 20 (d) 200
  26. 26.Which is closest to 302 × 21? (Round each number first.) (a) 60000 (b) 12000 (c) 6000 (d) 600
  27. 27.Round 28219 to the nearest ten.
  28. 28.Which is closest to 897 ÷ 29? (a) 60 (b) 15 (c) 300 (d) 30
  29. 29.Which is closest to 2100 ÷ 29? (a) 140 (b) 700 (c) 35 (d) 70
  30. 30.Which is closest to 1509 ÷ 31? (a) 500 (b) 50 (c) 100 (d) 25
  31. 31.Round 49.83 to one decimal place. =
  32. 32.Round 81.17 to one decimal place. =
  33. 33.Which is closest to 4504 ÷ 51? (a) 180 (b) 900 (c) 45 (d) 90
  34. 34.Round 95.22 to one decimal place. =
  35. 35.Which is closest to 1207 ÷ 41? (a) 60 (b) 15 (c) 300 (d) 30
  36. 36.Round 96.33 to one decimal place. =
  37. 37.Which is closest to 201 × 29? (Round each number first.) (a) 60000 (b) 6000 (c) 12000 (d) 600
  38. 38.Which is closest to 798 × 72? (Round each number first.) (a) 112000 (b) 5600 (c) 560000 (d) 56000
  39. 39.Which is closest to 496 × 82? (Round each number first.) (a) 40000 (b) 80000 (c) 4000 (d) 400000
  40. 40.Which is closest to 497 + 695 + 895? (a) 2000 (b) 2200 (c) 2100 (d) 2300

Answer key

  1. 1900
  2. 20000
  3. 68970
  4. 68.2
  5. 79.4
  6. 35000
  7. 26800
  8. 50
  9. 1700
  10. 28000
  11. 29510
  12. 6000
  13. 50020
  14. 24000
  15. 27000
  16. 90
  17. 50
  18. 51.3
  19. 30
  20. 65.9
  21. 62700
  22. 40
  23. 60410
  24. 16000
  25. 20
  26. 6000
  27. 28220
  28. 30
  29. 70
  30. 50
  31. 49.8
  32. 81.2
  33. 90
  34. 95.2
  35. 30
  36. 96.3
  37. 6000
  38. 56000
  39. 40000
  40. 2100

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