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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 375 · 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 297 × 39? (Round each number first.) (a) 12000 (b) 24000 (c) 1200 (d) 120000
  2. 2.Which is closest to 806 ÷ 39? (a) 10 (b) 40 (c) 20 (d) 200
  3. 3.Which is closest to 1804 ÷ 31? (a) 120 (b) 60 (c) 30 (d) 600
  4. 4.Which is closest to 398 × 28? (Round each number first.) (a) 120000 (b) 24000 (c) 12000 (d) 1200
  5. 5.Round 26132 to the nearest hundred.
  6. 6.Round 33717 to the nearest thousand.
  7. 7.Which is closest to 903 × 18? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  8. 8.Round 58.11 to one decimal place. =
  9. 9.Round 47760 to the nearest thousand.
  10. 10.Which is closest to 397 + 595 + 101? (a) 1100 (b) 1200 (c) 1000 (d) 1300
  11. 11.Round 95.61 to one decimal place. =
  12. 12.Round 29.38 to one decimal place. =
  13. 13.Round 25713 to the nearest ten.
  14. 14.Round 26032 to the nearest thousand.
  15. 15.Which is closest to 599 + 295 + 699? (a) 1700 (b) 1800 (c) 1600 (d) 1500
  16. 16.Round 93.24 to one decimal place. =
  17. 17.Round 29557 to the nearest hundred.
  18. 18.Which is closest to 796 × 22? (Round each number first.) (a) 32000 (b) 16000 (c) 1600 (d) 160000
  19. 19.Which is closest to 797 × 59? (Round each number first.) (a) 48000 (b) 4800 (c) 480000 (d) 96000
  20. 20.Which is closest to 697 + 704 + 198? (a) 1700 (b) 1800 (c) 1600 (d) 1500
  21. 21.Round 80.13 to one decimal place. =
  22. 22.Round 56701 to the nearest hundred.
  23. 23.Which is closest to 902 × 38? (Round each number first.) (a) 72000 (b) 360000 (c) 36000 (d) 3600
  24. 24.Which is closest to 498 × 39? (Round each number first.) (a) 40000 (b) 20000 (c) 200000 (d) 2000
  25. 25.Which is closest to 604 × 58? (Round each number first.) (a) 36000 (b) 72000 (c) 3600 (d) 360000
  26. 26.Which is closest to 3599 ÷ 39? (a) 180 (b) 90 (c) 45 (d) 900
  27. 27.Round 46.89 to one decimal place. =
  28. 28.Which is closest to 903 × 61? (Round each number first.) (a) 54000 (b) 540000 (c) 5400 (d) 108000
  29. 29.Which is closest to 896 + 605 + 897? (a) 2600 (b) 2300 (c) 2400 (d) 2500
  30. 30.Which is closest to 198 + 897 + 98? (a) 1400 (b) 1100 (c) 1200 (d) 1300
  31. 31.Which is closest to 297 × 62? (Round each number first.) (a) 1800 (b) 18000 (c) 36000 (d) 180000
  32. 32.Which is closest to 3591 ÷ 39? (a) 900 (b) 90 (c) 45 (d) 180
  33. 33.Which is closest to 1997 ÷ 39? (a) 50 (b) 500 (c) 100 (d) 25
  34. 34.Round 31612 to the nearest hundred.
  35. 35.Which is closest to 802 + 901 + 403? (a) 2100 (b) 2200 (c) 2000 (d) 2300
  36. 36.Round 43.77 to one decimal place. =
  37. 37.Round 70.68 to one decimal place. =
  38. 38.Which is closest to 802 ÷ 19? (a) 40 (b) 20 (c) 400 (d) 80
  39. 39.Round 40201 to the nearest hundred.
  40. 40.Which is closest to 498 + 595 + 498? (a) 1700 (b) 1800 (c) 1500 (d) 1600

Answer key

  1. 12000
  2. 20
  3. 60
  4. 12000
  5. 26100
  6. 34000
  7. 18000
  8. 58.1
  9. 48000
  10. 1100
  11. 95.6
  12. 29.4
  13. 25710
  14. 26000
  15. 1600
  16. 93.2
  17. 29600
  18. 16000
  19. 48000
  20. 1600
  21. 80.1
  22. 56700
  23. 36000
  24. 20000
  25. 36000
  26. 90
  27. 46.9
  28. 54000
  29. 2400
  30. 1200
  31. 18000
  32. 90
  33. 50
  34. 31600
  35. 2100
  36. 43.8
  37. 70.7
  38. 40
  39. 40200
  40. 1600

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