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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 39 · 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 200 × 41? (Round each number first.) (a) 800 (b) 80000 (c) 16000 (d) 8000
  2. 2.Which is closest to 1199 ÷ 39? (a) 15 (b) 300 (c) 60 (d) 30
  3. 3.Which is closest to 501 + 599 + 104? (a) 1300 (b) 1400 (c) 1100 (d) 1200
  4. 4.Round 5616 to the nearest thousand.
  5. 5.Which is closest to 1006 ÷ 21? (a) 500 (b) 50 (c) 25 (d) 100
  6. 6.Which is closest to 400 × 68? (Round each number first.) (a) 56000 (b) 2800 (c) 28000 (d) 280000
  7. 7.Which is closest to 1409 ÷ 21? (a) 70 (b) 700 (c) 140 (d) 35
  8. 8.Which is closest to 696 × 90? (Round each number first.) (a) 6300 (b) 126000 (c) 630000 (d) 63000
  9. 9.Round 78982 to the nearest ten.
  10. 10.Which is closest to 297 × 72? (Round each number first.) (a) 210000 (b) 42000 (c) 21000 (d) 2100
  11. 11.Which is closest to 204 × 70? (Round each number first.) (a) 140000 (b) 1400 (c) 28000 (d) 14000
  12. 12.Round 78.44 to one decimal place. =
  13. 13.Which is closest to 2508 ÷ 51? (a) 100 (b) 50 (c) 25 (d) 500
  14. 14.Which is closest to 296 + 397 + 98? (a) 900 (b) 800 (c) 700 (d) 1000
  15. 15.Which is closest to 398 × 82? (Round each number first.) (a) 320000 (b) 64000 (c) 32000 (d) 3200
  16. 16.Which is closest to 601 × 22? (Round each number first.) (a) 12000 (b) 1200 (c) 24000 (d) 120000
  17. 17.Which is closest to 2400 ÷ 39? (a) 120 (b) 600 (c) 30 (d) 60
  18. 18.Round 93.26 to one decimal place. =
  19. 19.Which is closest to 498 × 68? (Round each number first.) (a) 350000 (b) 35000 (c) 3500 (d) 70000
  20. 20.Which is closest to 394 ÷ 21? (a) 10 (b) 40 (c) 200 (d) 20
  21. 21.Round 95728 to the nearest hundred.
  22. 22.Which is closest to 697 + 296 + 597? (a) 1700 (b) 1800 (c) 1600 (d) 1500
  23. 23.Round 14092 to the nearest hundred.
  24. 24.Which is closest to 598 × 20? (Round each number first.) (a) 12000 (b) 24000 (c) 1200 (d) 120000
  25. 25.Which is closest to 401 ÷ 21? (a) 10 (b) 20 (c) 40 (d) 200
  26. 26.Round 31.16 to one decimal place. =
  27. 27.Which is closest to 797 × 51? (Round each number first.) (a) 400000 (b) 40000 (c) 80000 (d) 4000
  28. 28.Which is closest to 703 + 397 + 596? (a) 1600 (b) 1900 (c) 1700 (d) 1800
  29. 29.Round 48.86 to one decimal place. =
  30. 30.Which is closest to 898 × 62? (Round each number first.) (a) 54000 (b) 108000 (c) 540000 (d) 5400
  31. 31.Round 62.74 to one decimal place. =
  32. 32.Which is closest to 2395 ÷ 29? (a) 80 (b) 160 (c) 40 (d) 800
  33. 33.Which is closest to 296 × 92? (Round each number first.) (a) 270000 (b) 27000 (c) 54000 (d) 2700
  34. 34.Round 33.69 to one decimal place. =
  35. 35.Which is closest to 900 + 103 + 699? (a) 1700 (b) 1600 (c) 1800 (d) 1900
  36. 36.Round 33304 to the nearest ten.
  37. 37.Round 31061 to the nearest ten.
  38. 38.Round 21.89 to one decimal place. =
  39. 39.Round 15827 to the nearest thousand.
  40. 40.Round 50638 to the nearest ten.

Answer key

  1. 8000
  2. 30
  3. 1200
  4. 6000
  5. 50
  6. 28000
  7. 70
  8. 63000
  9. 78980
  10. 21000
  11. 14000
  12. 78.4
  13. 50
  14. 800
  15. 32000
  16. 12000
  17. 60
  18. 93.3
  19. 35000
  20. 20
  21. 95700
  22. 1600
  23. 14100
  24. 12000
  25. 20
  26. 31.2
  27. 40000
  28. 1700
  29. 48.9
  30. 54000
  31. 62.7
  32. 80
  33. 27000
  34. 33.7
  35. 1700
  36. 33300
  37. 31060
  38. 21.9
  39. 16000
  40. 50640

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