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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 645 · 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 700 × 89? (Round each number first.) (a) 630000 (b) 126000 (c) 63000 (d) 6300
  2. 2.Round 23146 to the nearest hundred.
  3. 3.Which is closest to 404 ÷ 21? (a) 10 (b) 40 (c) 200 (d) 20
  4. 4.Round 34933 to the nearest thousand.
  5. 5.Round 97906 to the nearest hundred.
  6. 6.Which is closest to 798 + 195 + 695? (a) 1900 (b) 1600 (c) 1800 (d) 1700
  7. 7.Round 18.47 to one decimal place. =
  8. 8.Which is closest to 200 × 71? (Round each number first.) (a) 28000 (b) 1400 (c) 140000 (d) 14000
  9. 9.Round 33454 to the nearest thousand.
  10. 10.Round 58.71 to one decimal place. =
  11. 11.Round 45648 to the nearest ten.
  12. 12.Round 37.81 to one decimal place. =
  13. 13.Round 36507 to the nearest hundred.
  14. 14.Round 32.33 to one decimal place. =
  15. 15.Which is closest to 1809 ÷ 19? (a) 900 (b) 180 (c) 45 (d) 90
  16. 16.Round 61204 to the nearest ten.
  17. 17.Which is closest to 1195 ÷ 29? (a) 40 (b) 20 (c) 80 (d) 400
  18. 18.Round 71.18 to one decimal place. =
  19. 19.Which is closest to 499 × 61? (Round each number first.) (a) 3000 (b) 60000 (c) 300000 (d) 30000
  20. 20.Round 29259 to the nearest hundred.
  21. 21.Round 49.78 to one decimal place. =
  22. 22.Round 38191 to the nearest hundred.
  23. 23.Round 89389 to the nearest thousand.
  24. 24.Which is closest to 598 + 102 + 897? (a) 1700 (b) 1500 (c) 1800 (d) 1600
  25. 25.Round 24.87 to one decimal place. =
  26. 26.Which is closest to 1195 ÷ 41? (a) 300 (b) 30 (c) 60 (d) 15
  27. 27.Round 33.49 to one decimal place. =
  28. 28.Which is closest to 2408 ÷ 41? (a) 30 (b) 600 (c) 60 (d) 120
  29. 29.Round 75417 to the nearest ten.
  30. 30.Which is closest to 902 × 80? (Round each number first.) (a) 720000 (b) 72000 (c) 144000 (d) 7200
  31. 31.Which is closest to 604 + 202 + 305? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  32. 32.Round 25.27 to one decimal place. =
  33. 33.Round 61.61 to one decimal place. =
  34. 34.Round 57.47 to one decimal place. =
  35. 35.Round 3813 to the nearest hundred.
  36. 36.Which is closest to 3992 ÷ 51? (a) 800 (b) 80 (c) 40 (d) 160
  37. 37.Which is closest to 601 + 300 + 198? (a) 1300 (b) 1100 (c) 1200 (d) 1000
  38. 38.Which is closest to 997 ÷ 49? (a) 10 (b) 200 (c) 20 (d) 40
  39. 39.Which is closest to 396 + 795 + 700? (a) 2100 (b) 1800 (c) 1900 (d) 2000
  40. 40.Which is closest to 297 × 22? (Round each number first.) (a) 6000 (b) 12000 (c) 60000 (d) 600

Answer key

  1. 63000
  2. 23100
  3. 20
  4. 35000
  5. 97900
  6. 1700
  7. 18.5
  8. 14000
  9. 33000
  10. 58.7
  11. 45650
  12. 37.8
  13. 36500
  14. 32.3
  15. 90
  16. 61200
  17. 40
  18. 71.2
  19. 30000
  20. 29300
  21. 49.8
  22. 38200
  23. 89000
  24. 1600
  25. 24.9
  26. 30
  27. 33.5
  28. 60
  29. 75420
  30. 72000
  31. 1100
  32. 25.3
  33. 61.6
  34. 57.5
  35. 3800
  36. 80
  37. 1100
  38. 20
  39. 1900
  40. 6000

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