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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 277 · 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 + 398 + 698? (a) 2100 (b) 2200 (c) 1900 (d) 2000
  2. 2.Which is closest to 496 × 81? (Round each number first.) (a) 40000 (b) 4000 (c) 400000 (d) 80000
  3. 3.Round 67218 to the nearest hundred.
  4. 4.Round 12158 to the nearest thousand.
  5. 5.Which is closest to 304 × 18? (Round each number first.) (a) 600 (b) 12000 (c) 60000 (d) 6000
  6. 6.Which is closest to 501 × 58? (Round each number first.) (a) 300000 (b) 30000 (c) 60000 (d) 3000
  7. 7.Round 63.87 to one decimal place. =
  8. 8.Which is closest to 408 ÷ 21? (a) 20 (b) 200 (c) 40 (d) 10
  9. 9.Round 15093 to the nearest hundred.
  10. 10.Round 53652 to the nearest hundred.
  11. 11.Which is closest to 105 + 600 + 401? (a) 1000 (b) 1100 (c) 1300 (d) 1200
  12. 12.Which is closest to 404 × 30? (Round each number first.) (a) 1200 (b) 12000 (c) 120000 (d) 24000
  13. 13.Which is closest to 303 × 92? (Round each number first.) (a) 54000 (b) 2700 (c) 270000 (d) 27000
  14. 14.Which is closest to 1493 ÷ 51? (a) 15 (b) 60 (c) 30 (d) 300
  15. 15.Round 16923 to the nearest hundred.
  16. 16.Which is closest to 2405 ÷ 31? (a) 160 (b) 40 (c) 80 (d) 800
  17. 17.Which is closest to 299 + 302 + 201? (a) 1000 (b) 700 (c) 800 (d) 900
  18. 18.Which is closest to 701 × 32? (Round each number first.) (a) 42000 (b) 210000 (c) 21000 (d) 2100
  19. 19.Which is closest to 702 × 82? (Round each number first.) (a) 560000 (b) 112000 (c) 56000 (d) 5600
  20. 20.Round 31.71 to one decimal place. =
  21. 21.Which is closest to 405 ÷ 19? (a) 40 (b) 20 (c) 200 (d) 10
  22. 22.Which is closest to 105 + 204 + 402? (a) 800 (b) 600 (c) 900 (d) 700
  23. 23.Which is closest to 1496 ÷ 29? (a) 100 (b) 500 (c) 25 (d) 50
  24. 24.Which is closest to 299 × 69? (Round each number first.) (a) 210000 (b) 2100 (c) 42000 (d) 21000
  25. 25.Which is closest to 1596 ÷ 19? (a) 800 (b) 80 (c) 40 (d) 160
  26. 26.Which is closest to 196 × 38? (Round each number first.) (a) 16000 (b) 80000 (c) 8000 (d) 800
  27. 27.Round 84215 to the nearest hundred.
  28. 28.Round 5482 to the nearest hundred.
  29. 29.Round 22002 to the nearest thousand.
  30. 30.Which is closest to 2408 ÷ 41? (a) 120 (b) 600 (c) 60 (d) 30
  31. 31.Which is closest to 596 + 201 + 601? (a) 1500 (b) 1300 (c) 1600 (d) 1400
  32. 32.Which is closest to 103 + 895 + 97? (a) 1300 (b) 1000 (c) 1200 (d) 1100
  33. 33.Which is closest to 698 + 798 + 495? (a) 2000 (b) 2100 (c) 1900 (d) 2200
  34. 34.Which is closest to 903 × 58? (Round each number first.) (a) 5400 (b) 108000 (c) 54000 (d) 540000
  35. 35.Round 55.23 to one decimal place. =
  36. 36.Which is closest to 992 ÷ 49? (a) 40 (b) 20 (c) 10 (d) 200
  37. 37.Which is closest to 799 × 69? (Round each number first.) (a) 56000 (b) 112000 (c) 560000 (d) 5600
  38. 38.Which is closest to 1795 ÷ 29? (a) 120 (b) 60 (c) 600 (d) 30
  39. 39.Round 38892 to the nearest hundred.
  40. 40.Round 73.22 to one decimal place. =

Answer key

  1. 2000
  2. 40000
  3. 67200
  4. 12000
  5. 6000
  6. 30000
  7. 63.9
  8. 20
  9. 15100
  10. 53700
  11. 1100
  12. 12000
  13. 27000
  14. 30
  15. 16900
  16. 80
  17. 800
  18. 21000
  19. 56000
  20. 31.7
  21. 20
  22. 700
  23. 50
  24. 21000
  25. 80
  26. 8000
  27. 84200
  28. 5500
  29. 22000
  30. 60
  31. 1400
  32. 1100
  33. 2000
  34. 54000
  35. 55.2
  36. 20
  37. 56000
  38. 60
  39. 38900
  40. 73.2

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