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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 255 · 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 68480 to the nearest hundred.
  2. 2.Round 59.91 to one decimal place. =
  3. 3.Round 50.94 to one decimal place. =
  4. 4.Round 72.36 to one decimal place. =
  5. 5.Round 61.88 to one decimal place. =
  6. 6.Round 58.36 to one decimal place. =
  7. 7.Which is closest to 902 + 398 + 504? (a) 2000 (b) 1700 (c) 1800 (d) 1900
  8. 8.Which is closest to 499 × 40? (Round each number first.) (a) 40000 (b) 200000 (c) 20000 (d) 2000
  9. 9.Round 91940 to the nearest hundred.
  10. 10.Which is closest to 797 × 31? (Round each number first.) (a) 2400 (b) 48000 (c) 24000 (d) 240000
  11. 11.Which is closest to 396 × 69? (Round each number first.) (a) 280000 (b) 56000 (c) 2800 (d) 28000
  12. 12.Round 79823 to the nearest thousand.
  13. 13.Round 64.19 to one decimal place. =
  14. 14.Which is closest to 2502 ÷ 49? (a) 25 (b) 100 (c) 50 (d) 500
  15. 15.Round 74509 to the nearest ten.
  16. 16.Which is closest to 1406 ÷ 19? (a) 700 (b) 70 (c) 140 (d) 35
  17. 17.Which is closest to 401 × 90? (Round each number first.) (a) 72000 (b) 36000 (c) 360000 (d) 3600
  18. 18.Which is closest to 3004 ÷ 51? (a) 30 (b) 120 (c) 600 (d) 60
  19. 19.Round 56660 to the nearest thousand.
  20. 20.Which is closest to 403 × 52? (Round each number first.) (a) 40000 (b) 20000 (c) 2000 (d) 200000
  21. 21.Round 65868 to the nearest hundred.
  22. 22.Round 99.29 to one decimal place. =
  23. 23.Round 74.78 to one decimal place. =
  24. 24.Which is closest to 296 × 60? (Round each number first.) (a) 1800 (b) 18000 (c) 180000 (d) 36000
  25. 25.Round 69701 to the nearest thousand.
  26. 26.Round 70.43 to one decimal place. =
  27. 27.Round 26684 to the nearest hundred.
  28. 28.Which is closest to 501 × 32? (Round each number first.) (a) 1500 (b) 150000 (c) 30000 (d) 15000
  29. 29.Round 14.68 to one decimal place. =
  30. 30.Round 79.24 to one decimal place. =
  31. 31.Which is closest to 598 × 90? (Round each number first.) (a) 5400 (b) 108000 (c) 540000 (d) 54000
  32. 32.Which is closest to 99 + 899 + 604? (a) 1800 (b) 1600 (c) 1500 (d) 1700
  33. 33.Round 99.37 to one decimal place. =
  34. 34.Which is closest to 201 × 62? (Round each number first.) (a) 24000 (b) 12000 (c) 120000 (d) 1200
  35. 35.Which is closest to 804 × 52? (Round each number first.) (a) 40000 (b) 400000 (c) 4000 (d) 80000
  36. 36.Round 6888 to the nearest hundred.
  37. 37.Which is closest to 994 ÷ 49? (a) 40 (b) 10 (c) 200 (d) 20
  38. 38.Which is closest to 504 × 59? (Round each number first.) (a) 30000 (b) 300000 (c) 3000 (d) 60000
  39. 39.Which is closest to 999 ÷ 21? (a) 25 (b) 100 (c) 500 (d) 50
  40. 40.Round 6813 to the nearest hundred.

Answer key

  1. 68500
  2. 59.9
  3. 50.9
  4. 72.4
  5. 61.9
  6. 58.4
  7. 1800
  8. 20000
  9. 91900
  10. 24000
  11. 28000
  12. 80000
  13. 64.2
  14. 50
  15. 74510
  16. 70
  17. 36000
  18. 60
  19. 57000
  20. 20000
  21. 65900
  22. 99.3
  23. 74.8
  24. 18000
  25. 70000
  26. 70.4
  27. 26700
  28. 15000
  29. 14.7
  30. 79.2
  31. 54000
  32. 1600
  33. 99.4
  34. 12000
  35. 40000
  36. 6900
  37. 20
  38. 30000
  39. 50
  40. 6800

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