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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 393 · 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 58622 to the nearest hundred.
  2. 2.Which is closest to 598 × 61? (Round each number first.) (a) 360000 (b) 72000 (c) 36000 (d) 3600
  3. 3.Round 49.82 to one decimal place. =
  4. 4.Which is closest to 1393 ÷ 19? (a) 700 (b) 70 (c) 35 (d) 140
  5. 5.Which is closest to 201 × 39? (Round each number first.) (a) 80000 (b) 800 (c) 16000 (d) 8000
  6. 6.Round 62.13 to one decimal place. =
  7. 7.Which is closest to 300 + 100 + 696? (a) 1300 (b) 1100 (c) 1200 (d) 1000
  8. 8.Round 49638 to the nearest thousand.
  9. 9.Round 69.82 to one decimal place. =
  10. 10.Round 10.37 to one decimal place. =
  11. 11.Which is closest to 405 + 502 + 699? (a) 1500 (b) 1600 (c) 1800 (d) 1700
  12. 12.Which is closest to 504 + 404 + 896? (a) 1800 (b) 1700 (c) 1900 (d) 2000
  13. 13.Round 37.06 to one decimal place. =
  14. 14.Which is closest to 4494 ÷ 51? (a) 900 (b) 180 (c) 90 (d) 45
  15. 15.Round 9508 to the nearest hundred.
  16. 16.Round 89326 to the nearest hundred.
  17. 17.Round 4115 to the nearest thousand.
  18. 18.Which is closest to 298 × 22? (Round each number first.) (a) 600 (b) 12000 (c) 60000 (d) 6000
  19. 19.Which is closest to 699 + 404 + 297? (a) 1600 (b) 1500 (c) 1300 (d) 1400
  20. 20.Which is closest to 1808 ÷ 21? (a) 180 (b) 900 (c) 90 (d) 45
  21. 21.Which is closest to 602 × 21? (Round each number first.) (a) 24000 (b) 120000 (c) 1200 (d) 12000
  22. 22.Which is closest to 604 × 20? (Round each number first.) (a) 24000 (b) 12000 (c) 120000 (d) 1200
  23. 23.Round 90209 to the nearest ten.
  24. 24.Round 40672 to the nearest ten.
  25. 25.Round 44.89 to one decimal place. =
  26. 26.Round 96121 to the nearest thousand.
  27. 27.Round 27.24 to one decimal place. =
  28. 28.Round 58900 to the nearest thousand.
  29. 29.Round 77.78 to one decimal place. =
  30. 30.Round 19013 to the nearest hundred.
  31. 31.Round 42.59 to one decimal place. =
  32. 32.Round 62.09 to one decimal place. =
  33. 33.Round 18742 to the nearest thousand.
  34. 34.Which is closest to 498 × 42? (Round each number first.) (a) 2000 (b) 40000 (c) 200000 (d) 20000
  35. 35.Which is closest to 1807 ÷ 29? (a) 120 (b) 30 (c) 60 (d) 600
  36. 36.Which is closest to 1191 ÷ 21? (a) 120 (b) 30 (c) 60 (d) 600
  37. 37.Round 38.31 to one decimal place. =
  38. 38.Round 26618 to the nearest ten.
  39. 39.Which is closest to 3509 ÷ 51? (a) 35 (b) 140 (c) 700 (d) 70
  40. 40.Which is closest to 2099 ÷ 31? (a) 140 (b) 35 (c) 700 (d) 70

Answer key

  1. 58600
  2. 36000
  3. 49.8
  4. 70
  5. 8000
  6. 62.1
  7. 1100
  8. 50000
  9. 69.8
  10. 10.4
  11. 1600
  12. 1800
  13. 37.1
  14. 90
  15. 9500
  16. 89300
  17. 4000
  18. 6000
  19. 1400
  20. 90
  21. 12000
  22. 12000
  23. 90210
  24. 40670
  25. 44.9
  26. 96000
  27. 27.2
  28. 59000
  29. 77.8
  30. 19000
  31. 42.6
  32. 62.1
  33. 19000
  34. 20000
  35. 60
  36. 60
  37. 38.3
  38. 26620
  39. 70
  40. 70

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