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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 849 · 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 198 × 91? (Round each number first.) (a) 36000 (b) 18000 (c) 180000 (d) 1800
  2. 2.Which is closest to 801 × 81? (Round each number first.) (a) 6400 (b) 64000 (c) 640000 (d) 128000
  3. 3.Which is closest to 1799 ÷ 29? (a) 120 (b) 30 (c) 600 (d) 60
  4. 4.Round 97260 to the nearest thousand.
  5. 5.Round 71.81 to one decimal place. =
  6. 6.Which is closest to 903 + 299 + 402? (a) 1800 (b) 1600 (c) 1500 (d) 1700
  7. 7.Round 5993 to the nearest hundred.
  8. 8.Round 4006 to the nearest ten.
  9. 9.Which is closest to 496 × 30? (Round each number first.) (a) 15000 (b) 150000 (c) 30000 (d) 1500
  10. 10.Which is closest to 602 ÷ 19? (a) 300 (b) 30 (c) 15 (d) 60
  11. 11.Round 70.83 to one decimal place. =
  12. 12.Which is closest to 496 × 29? (Round each number first.) (a) 1500 (b) 150000 (c) 30000 (d) 15000
  13. 13.Which is closest to 900 × 72? (Round each number first.) (a) 6300 (b) 630000 (c) 126000 (d) 63000
  14. 14.Round 39.29 to one decimal place. =
  15. 15.Which is closest to 893 ÷ 31? (a) 300 (b) 30 (c) 60 (d) 15
  16. 16.Round 77.19 to one decimal place. =
  17. 17.Which is closest to 299 × 91? (Round each number first.) (a) 270000 (b) 27000 (c) 54000 (d) 2700
  18. 18.Round 87.38 to one decimal place. =
  19. 19.Round 6605 to the nearest thousand.
  20. 20.Round 29601 to the nearest hundred.
  21. 21.Which is closest to 798 × 48? (Round each number first.) (a) 4000 (b) 80000 (c) 40000 (d) 400000
  22. 22.Round 39.23 to one decimal place. =
  23. 23.Which is closest to 696 × 49? (Round each number first.) (a) 350000 (b) 35000 (c) 3500 (d) 70000
  24. 24.Round 17.56 to one decimal place. =
  25. 25.Which is closest to 600 + 197 + 802? (a) 1600 (b) 1700 (c) 1500 (d) 1800
  26. 26.Which is closest to 204 × 88? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  27. 27.Round 14.77 to one decimal place. =
  28. 28.Which is closest to 3196 ÷ 41? (a) 800 (b) 40 (c) 160 (d) 80
  29. 29.Which is closest to 297 × 59? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000
  30. 30.Which is closest to 403 × 49? (Round each number first.) (a) 2000 (b) 20000 (c) 200000 (d) 40000
  31. 31.Which is closest to 204 × 28? (Round each number first.) (a) 600 (b) 60000 (c) 12000 (d) 6000
  32. 32.Round 36.54 to one decimal place. =
  33. 33.Which is closest to 896 + 203 + 395? (a) 1500 (b) 1700 (c) 1400 (d) 1600
  34. 34.Which is closest to 1800 ÷ 21? (a) 900 (b) 180 (c) 45 (d) 90
  35. 35.Round 59.72 to one decimal place. =
  36. 36.Which is closest to 600 × 61? (Round each number first.) (a) 360000 (b) 3600 (c) 36000 (d) 72000
  37. 37.Which is closest to 602 + 197 + 495? (a) 1500 (b) 1200 (c) 1400 (d) 1300
  38. 38.Round 46.61 to one decimal place. =
  39. 39.Which is closest to 505 + 98 + 803? (a) 1600 (b) 1300 (c) 1400 (d) 1500
  40. 40.Which is closest to 504 × 59? (Round each number first.) (a) 60000 (b) 30000 (c) 300000 (d) 3000

Answer key

  1. 18000
  2. 64000
  3. 60
  4. 97000
  5. 71.8
  6. 1600
  7. 6000
  8. 4010
  9. 15000
  10. 30
  11. 70.8
  12. 15000
  13. 63000
  14. 39.3
  15. 30
  16. 77.2
  17. 27000
  18. 87.4
  19. 7000
  20. 29600
  21. 40000
  22. 39.2
  23. 35000
  24. 17.6
  25. 1600
  26. 18000
  27. 14.8
  28. 80
  29. 18000
  30. 20000
  31. 6000
  32. 36.5
  33. 1500
  34. 90
  35. 59.7
  36. 36000
  37. 1300
  38. 46.6
  39. 1400
  40. 30000

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