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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 658 · 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 3593 ÷ 41? (a) 180 (b) 900 (c) 45 (d) 90
  2. 2.Which is closest to 3495 ÷ 51? (a) 700 (b) 70 (c) 35 (d) 140
  3. 3.Which is closest to 600 × 68? (Round each number first.) (a) 4200 (b) 42000 (c) 84000 (d) 420000
  4. 4.Which is closest to 2692 ÷ 29? (a) 45 (b) 900 (c) 90 (d) 180
  5. 5.Round 45.58 to one decimal place. =
  6. 6.Which is closest to 905 + 504 + 902? (a) 2200 (b) 2500 (c) 2400 (d) 2300
  7. 7.Which is closest to 799 × 19? (Round each number first.) (a) 1600 (b) 32000 (c) 16000 (d) 160000
  8. 8.Round 41.87 to one decimal place. =
  9. 9.Which is closest to 604 + 397 + 402? (a) 1600 (b) 1300 (c) 1500 (d) 1400
  10. 10.Round 24.41 to one decimal place. =
  11. 11.Which is closest to 597 × 90? (Round each number first.) (a) 540000 (b) 54000 (c) 108000 (d) 5400
  12. 12.Round 48.72 to one decimal place. =
  13. 13.Which is closest to 396 × 70? (Round each number first.) (a) 28000 (b) 280000 (c) 56000 (d) 2800
  14. 14.Round 24431 to the nearest hundred.
  15. 15.Round 12.82 to one decimal place. =
  16. 16.Round 51868 to the nearest hundred.
  17. 17.Which is closest to 2409 ÷ 31? (a) 40 (b) 80 (c) 160 (d) 800
  18. 18.Which is closest to 4506 ÷ 51? (a) 180 (b) 90 (c) 900 (d) 45
  19. 19.Which is closest to 1609 ÷ 39? (a) 40 (b) 400 (c) 80 (d) 20
  20. 20.Which is closest to 808 ÷ 41? (a) 40 (b) 20 (c) 10 (d) 200
  21. 21.Round 35.66 to one decimal place. =
  22. 22.Which is closest to 597 + 895 + 497? (a) 2000 (b) 2200 (c) 1900 (d) 2100
  23. 23.Which is closest to 2698 ÷ 31? (a) 900 (b) 180 (c) 45 (d) 90
  24. 24.Round 11.52 to one decimal place. =
  25. 25.Which is closest to 695 + 99 + 395? (a) 1400 (b) 1200 (c) 1300 (d) 1100
  26. 26.Round 15401 to the nearest hundred.
  27. 27.Which is closest to 200 × 61? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
  28. 28.Which is closest to 601 + 898 + 403? (a) 2000 (b) 1900 (c) 1800 (d) 2100
  29. 29.Round 30008 to the nearest hundred.
  30. 30.Round 84543 to the nearest hundred.
  31. 31.Round 21.58 to one decimal place. =
  32. 32.Round 65.27 to one decimal place. =
  33. 33.Which is closest to 297 + 800 + 695? (a) 1800 (b) 1900 (c) 2000 (d) 1700
  34. 34.Which is closest to 393 ÷ 19? (a) 20 (b) 200 (c) 40 (d) 10
  35. 35.Which is closest to 1491 ÷ 51? (a) 30 (b) 60 (c) 15 (d) 300
  36. 36.Round 55.22 to one decimal place. =
  37. 37.Round 61.18 to one decimal place. =
  38. 38.Round 66.76 to one decimal place. =
  39. 39.Which is closest to 702 × 20? (Round each number first.) (a) 14000 (b) 140000 (c) 28000 (d) 1400
  40. 40.Which is closest to 397 × 21? (Round each number first.) (a) 800 (b) 16000 (c) 80000 (d) 8000

Answer key

  1. 90
  2. 70
  3. 42000
  4. 90
  5. 45.6
  6. 2300
  7. 16000
  8. 41.9
  9. 1400
  10. 24.4
  11. 54000
  12. 48.7
  13. 28000
  14. 24400
  15. 12.8
  16. 51900
  17. 80
  18. 90
  19. 40
  20. 20
  21. 35.7
  22. 2000
  23. 90
  24. 11.5
  25. 1200
  26. 15400
  27. 12000
  28. 1900
  29. 30000
  30. 84500
  31. 21.6
  32. 65.3
  33. 1800
  34. 20
  35. 30
  36. 55.2
  37. 61.2
  38. 66.8
  39. 14000
  40. 8000

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