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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 564 · 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 70.93 to one decimal place. =
  2. 2.Which is closest to 1002 ÷ 49? (a) 40 (b) 10 (c) 20 (d) 200
  3. 3.Round 29901 to the nearest hundred.
  4. 4.Round 52.94 to one decimal place. =
  5. 5.Which is closest to 1506 ÷ 49? (a) 60 (b) 15 (c) 30 (d) 300
  6. 6.Round 75.17 to one decimal place. =
  7. 7.Which is closest to 902 + 103 + 800? (a) 2000 (b) 1800 (c) 1900 (d) 1700
  8. 8.Which is closest to 896 × 28? (Round each number first.) (a) 270000 (b) 54000 (c) 2700 (d) 27000
  9. 9.Which is closest to 903 × 20? (Round each number first.) (a) 180000 (b) 1800 (c) 18000 (d) 36000
  10. 10.Which is closest to 405 + 603 + 198? (a) 1300 (b) 1200 (c) 1100 (d) 1400
  11. 11.Round 54786 to the nearest hundred.
  12. 12.Round 58.43 to one decimal place. =
  13. 13.Round 85660 to the nearest thousand.
  14. 14.Which is closest to 1002 ÷ 51? (a) 200 (b) 10 (c) 20 (d) 40
  15. 15.Round 41993 to the nearest hundred.
  16. 16.Which is closest to 299 + 401 + 97? (a) 900 (b) 700 (c) 1000 (d) 800
  17. 17.Round 86685 to the nearest thousand.
  18. 18.Which is closest to 1195 ÷ 41? (a) 300 (b) 60 (c) 30 (d) 15
  19. 19.Round 92.69 to one decimal place. =
  20. 20.Which is closest to 1600 ÷ 19? (a) 800 (b) 80 (c) 40 (d) 160
  21. 21.Which is closest to 497 × 60? (Round each number first.) (a) 3000 (b) 60000 (c) 30000 (d) 300000
  22. 22.Round 28.84 to one decimal place. =
  23. 23.Round 44114 to the nearest hundred.
  24. 24.Which is closest to 696 × 89? (Round each number first.) (a) 630000 (b) 6300 (c) 126000 (d) 63000
  25. 25.Round 35927 to the nearest hundred.
  26. 26.Which is closest to 496 × 71? (Round each number first.) (a) 35000 (b) 3500 (c) 70000 (d) 350000
  27. 27.Which is closest to 303 × 38? (Round each number first.) (a) 12000 (b) 1200 (c) 24000 (d) 120000
  28. 28.Which is closest to 2009 ÷ 51? (a) 400 (b) 20 (c) 80 (d) 40
  29. 29.Which is closest to 903 ÷ 31? (a) 300 (b) 30 (c) 60 (d) 15
  30. 30.Which is closest to 396 × 92? (Round each number first.) (a) 360000 (b) 72000 (c) 36000 (d) 3600
  31. 31.Which is closest to 399 + 198 + 497? (a) 1100 (b) 1000 (c) 1200 (d) 1300
  32. 32.Round 93.52 to one decimal place. =
  33. 33.Which is closest to 403 × 51? (Round each number first.) (a) 40000 (b) 20000 (c) 2000 (d) 200000
  34. 34.Which is closest to 1004 ÷ 51? (a) 200 (b) 10 (c) 40 (d) 20
  35. 35.Which is closest to 1597 ÷ 19? (a) 40 (b) 800 (c) 80 (d) 160
  36. 36.Which is closest to 502 + 696 + 196? (a) 1400 (b) 1500 (c) 1300 (d) 1600
  37. 37.Round 8239 to the nearest hundred.
  38. 38.Round 13832 to the nearest hundred.
  39. 39.Round 39.52 to one decimal place. =
  40. 40.Round 88.14 to one decimal place. =

Answer key

  1. 70.9
  2. 20
  3. 29900
  4. 52.9
  5. 30
  6. 75.2
  7. 1800
  8. 27000
  9. 18000
  10. 1200
  11. 54800
  12. 58.4
  13. 86000
  14. 20
  15. 42000
  16. 800
  17. 87000
  18. 30
  19. 92.7
  20. 80
  21. 30000
  22. 28.8
  23. 44100
  24. 63000
  25. 35900
  26. 35000
  27. 12000
  28. 40
  29. 30
  30. 36000
  31. 1100
  32. 93.5
  33. 20000
  34. 20
  35. 80
  36. 1400
  37. 8200
  38. 13800
  39. 39.5
  40. 88.1

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