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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 217 · 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 803 × 38? (Round each number first.) (a) 320000 (b) 32000 (c) 64000 (d) 3200
  2. 2.Which is closest to 1509 ÷ 29? (a) 25 (b) 100 (c) 500 (d) 50
  3. 3.Round 30.52 to one decimal place. =
  4. 4.Which is closest to 703 × 22? (Round each number first.) (a) 140000 (b) 28000 (c) 14000 (d) 1400
  5. 5.Round 27.71 to one decimal place. =
  6. 6.Round 75224 to the nearest thousand.
  7. 7.Round 20971 to the nearest hundred.
  8. 8.Round 40.38 to one decimal place. =
  9. 9.Round 84487 to the nearest hundred.
  10. 10.Which is closest to 301 + 403 + 402? (a) 1100 (b) 1300 (c) 1000 (d) 1200
  11. 11.Which is closest to 2007 ÷ 39? (a) 50 (b) 25 (c) 500 (d) 100
  12. 12.Which is closest to 3601 ÷ 41? (a) 180 (b) 45 (c) 900 (d) 90
  13. 13.Round 86.32 to one decimal place. =
  14. 14.Which is closest to 598 × 92? (Round each number first.) (a) 5400 (b) 54000 (c) 540000 (d) 108000
  15. 15.Round 12.22 to one decimal place. =
  16. 16.Which is closest to 904 × 88? (Round each number first.) (a) 810000 (b) 8100 (c) 81000 (d) 162000
  17. 17.Which is closest to 498 × 69? (Round each number first.) (a) 35000 (b) 70000 (c) 350000 (d) 3500
  18. 18.Round 18.84 to one decimal place. =
  19. 19.Which is closest to 298 + 201 + 598? (a) 1100 (b) 1200 (c) 1000 (d) 1300
  20. 20.Round 95539 to the nearest thousand.
  21. 21.Which is closest to 199 × 82? (Round each number first.) (a) 160000 (b) 32000 (c) 1600 (d) 16000
  22. 22.Which is closest to 1002 ÷ 19? (a) 100 (b) 500 (c) 25 (d) 50
  23. 23.Which is closest to 199 + 704 + 305? (a) 1400 (b) 1300 (c) 1100 (d) 1200
  24. 24.Which is closest to 796 + 301 + 105? (a) 1200 (b) 1400 (c) 1300 (d) 1100
  25. 25.Round 98.33 to one decimal place. =
  26. 26.Which is closest to 700 × 88? (Round each number first.) (a) 6300 (b) 630000 (c) 63000 (d) 126000
  27. 27.Which is closest to 201 × 28? (Round each number first.) (a) 60000 (b) 600 (c) 12000 (d) 6000
  28. 28.Which is closest to 804 × 42? (Round each number first.) (a) 320000 (b) 3200 (c) 32000 (d) 64000
  29. 29.Round 87.22 to one decimal place. =
  30. 30.Which is closest to 3000 ÷ 49? (a) 600 (b) 60 (c) 30 (d) 120
  31. 31.Round 21.43 to one decimal place. =
  32. 32.Which is closest to 497 × 82? (Round each number first.) (a) 400000 (b) 4000 (c) 40000 (d) 80000
  33. 33.Which is closest to 405 + 105 + 701? (a) 1100 (b) 1400 (c) 1300 (d) 1200
  34. 34.Round 33.53 to one decimal place. =
  35. 35.Which is closest to 800 × 18? (Round each number first.) (a) 16000 (b) 32000 (c) 160000 (d) 1600
  36. 36.Which is closest to 302 + 499 + 203? (a) 1200 (b) 1100 (c) 900 (d) 1000
  37. 37.Round 31.66 to one decimal place. =
  38. 38.Round 70.73 to one decimal place. =
  39. 39.Which is closest to 500 × 78? (Round each number first.) (a) 80000 (b) 400000 (c) 4000 (d) 40000
  40. 40.Round 93.53 to one decimal place. =

Answer key

  1. 32000
  2. 50
  3. 30.5
  4. 14000
  5. 27.7
  6. 75000
  7. 21000
  8. 40.4
  9. 84500
  10. 1100
  11. 50
  12. 90
  13. 86.3
  14. 54000
  15. 12.2
  16. 81000
  17. 35000
  18. 18.8
  19. 1100
  20. 96000
  21. 16000
  22. 50
  23. 1200
  24. 1200
  25. 98.3
  26. 63000
  27. 6000
  28. 32000
  29. 87.2
  30. 60
  31. 21.4
  32. 40000
  33. 1200
  34. 33.5
  35. 16000
  36. 1000
  37. 31.7
  38. 70.7
  39. 40000
  40. 93.5

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