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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 216 · 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 78461 to the nearest ten.
  2. 2.Round 56.73 to one decimal place. =
  3. 3.Which is closest to 403 × 40? (Round each number first.) (a) 32000 (b) 160000 (c) 1600 (d) 16000
  4. 4.Round 98.78 to one decimal place. =
  5. 5.Round 65.66 to one decimal place. =
  6. 6.Which is closest to 896 + 201 + 395? (a) 1500 (b) 1400 (c) 1600 (d) 1700
  7. 7.Which is closest to 897 × 32? (Round each number first.) (a) 27000 (b) 2700 (c) 270000 (d) 54000
  8. 8.Which is closest to 1999 ÷ 39? (a) 500 (b) 25 (c) 50 (d) 100
  9. 9.Round 30109 to the nearest hundred.
  10. 10.Which is closest to 698 × 32? (Round each number first.) (a) 210000 (b) 42000 (c) 21000 (d) 2100
  11. 11.Which is closest to 896 + 101 + 698? (a) 1700 (b) 1600 (c) 1800 (d) 1900
  12. 12.Which is closest to 702 + 598 + 796? (a) 2300 (b) 2000 (c) 2100 (d) 2200
  13. 13.Which is closest to 1603 ÷ 21? (a) 40 (b) 80 (c) 160 (d) 800
  14. 14.Round 77043 to the nearest thousand.
  15. 15.Which is closest to 1005 ÷ 51? (a) 200 (b) 40 (c) 20 (d) 10
  16. 16.Round 88.89 to one decimal place. =
  17. 17.Which is closest to 1502 ÷ 51? (a) 30 (b) 300 (c) 60 (d) 15
  18. 18.Which is closest to 401 + 803 + 498? (a) 1800 (b) 1600 (c) 1900 (d) 1700
  19. 19.Round 67.41 to one decimal place. =
  20. 20.Which is closest to 400 × 68? (Round each number first.) (a) 2800 (b) 28000 (c) 280000 (d) 56000
  21. 21.Which is closest to 702 × 91? (Round each number first.) (a) 63000 (b) 126000 (c) 6300 (d) 630000
  22. 22.Which is closest to 599 × 50? (Round each number first.) (a) 300000 (b) 3000 (c) 60000 (d) 30000
  23. 23.Round 62104 to the nearest thousand.
  24. 24.Round 61.09 to one decimal place. =
  25. 25.Round 56811 to the nearest hundred.
  26. 26.Round 58317 to the nearest hundred.
  27. 27.Round 68.47 to one decimal place. =
  28. 28.Which is closest to 300 × 88? (Round each number first.) (a) 54000 (b) 27000 (c) 2700 (d) 270000
  29. 29.Round 85.87 to one decimal place. =
  30. 30.Which is closest to 801 × 60? (Round each number first.) (a) 96000 (b) 4800 (c) 48000 (d) 480000
  31. 31.Round 12.69 to one decimal place. =
  32. 32.Which is closest to 1999 ÷ 49? (a) 400 (b) 20 (c) 80 (d) 40
  33. 33.Which is closest to 1796 ÷ 19? (a) 180 (b) 900 (c) 90 (d) 45
  34. 34.Which is closest to 1192 ÷ 41? (a) 300 (b) 30 (c) 15 (d) 60
  35. 35.Which is closest to 2994 ÷ 49? (a) 120 (b) 60 (c) 600 (d) 30
  36. 36.Which is closest to 2009 ÷ 49? (a) 80 (b) 20 (c) 40 (d) 400
  37. 37.Which is closest to 897 + 103 + 200? (a) 1200 (b) 1100 (c) 1400 (d) 1300
  38. 38.Which is closest to 807 ÷ 39? (a) 10 (b) 200 (c) 40 (d) 20
  39. 39.Which is closest to 597 × 71? (Round each number first.) (a) 420000 (b) 84000 (c) 42000 (d) 4200
  40. 40.Round 20.27 to one decimal place. =

Answer key

  1. 78460
  2. 56.7
  3. 16000
  4. 98.8
  5. 65.7
  6. 1500
  7. 27000
  8. 50
  9. 30100
  10. 21000
  11. 1700
  12. 2100
  13. 80
  14. 77000
  15. 20
  16. 88.9
  17. 30
  18. 1700
  19. 67.4
  20. 28000
  21. 63000
  22. 30000
  23. 62000
  24. 61.1
  25. 56800
  26. 58300
  27. 68.5
  28. 27000
  29. 85.9
  30. 48000
  31. 12.7
  32. 40
  33. 90
  34. 30
  35. 60
  36. 40
  37. 1200
  38. 20
  39. 42000
  40. 20.3

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