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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 330 · 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 79.73 to one decimal place. =
  2. 2.Round 99819 to the nearest ten.
  3. 3.Which is closest to 399 + 103 + 397? (a) 1000 (b) 1100 (c) 800 (d) 900
  4. 4.Which is closest to 4504 ÷ 49? (a) 900 (b) 45 (c) 90 (d) 180
  5. 5.Which is closest to 903 ÷ 31? (a) 300 (b) 30 (c) 15 (d) 60
  6. 6.Round 97.07 to one decimal place. =
  7. 7.Which is closest to 605 ÷ 29? (a) 200 (b) 10 (c) 40 (d) 20
  8. 8.Round 15491 to the nearest thousand.
  9. 9.Round 81.61 to one decimal place. =
  10. 10.Which is closest to 200 × 38? (Round each number first.) (a) 80000 (b) 8000 (c) 16000 (d) 800
  11. 11.Which is closest to 398 + 804 + 505? (a) 1800 (b) 1700 (c) 1900 (d) 1600
  12. 12.Round 71004 to the nearest thousand.
  13. 13.Which is closest to 899 × 80? (Round each number first.) (a) 720000 (b) 7200 (c) 144000 (d) 72000
  14. 14.Round 82800 to the nearest thousand.
  15. 15.Round 82.42 to one decimal place. =
  16. 16.Which is closest to 700 + 802 + 701? (a) 2300 (b) 2100 (c) 2400 (d) 2200
  17. 17.Round 71.32 to one decimal place. =
  18. 18.Round 48.81 to one decimal place. =
  19. 19.Which is closest to 802 × 48? (Round each number first.) (a) 4000 (b) 40000 (c) 400000 (d) 80000
  20. 20.Round 31362 to the nearest thousand.
  21. 21.Which is closest to 603 + 503 + 803? (a) 1800 (b) 2000 (c) 1900 (d) 2100
  22. 22.Which is closest to 696 × 41? (Round each number first.) (a) 2800 (b) 280000 (c) 56000 (d) 28000
  23. 23.Which is closest to 400 × 22? (Round each number first.) (a) 800 (b) 80000 (c) 8000 (d) 16000
  24. 24.Which is closest to 202 + 699 + 96? (a) 1200 (b) 900 (c) 1000 (d) 1100
  25. 25.Which is closest to 699 + 703 + 100? (a) 1700 (b) 1600 (c) 1400 (d) 1500
  26. 26.Which is closest to 3502 ÷ 49? (a) 35 (b) 140 (c) 700 (d) 70
  27. 27.Which is closest to 3504 ÷ 49? (a) 140 (b) 35 (c) 700 (d) 70
  28. 28.Round 64070 to the nearest hundred.
  29. 29.Which is closest to 1196 ÷ 39? (a) 15 (b) 60 (c) 30 (d) 300
  30. 30.Which is closest to 703 + 205 + 200? (a) 1200 (b) 1100 (c) 1000 (d) 1300
  31. 31.Which is closest to 596 × 81? (Round each number first.) (a) 4800 (b) 48000 (c) 96000 (d) 480000
  32. 32.Which is closest to 802 ÷ 39? (a) 20 (b) 200 (c) 10 (d) 40
  33. 33.Which is closest to 4505 ÷ 51? (a) 180 (b) 90 (c) 45 (d) 900
  34. 34.Which is closest to 2104 ÷ 31? (a) 70 (b) 140 (c) 35 (d) 700
  35. 35.Round 10258 to the nearest hundred.
  36. 36.Round 18010 to the nearest thousand.
  37. 37.Which is closest to 300 + 902 + 405? (a) 1600 (b) 1700 (c) 1500 (d) 1800
  38. 38.Round 85582 to the nearest thousand.
  39. 39.Which is closest to 1495 ÷ 49? (a) 300 (b) 60 (c) 30 (d) 15
  40. 40.Round 52.52 to one decimal place. =

Answer key

  1. 79.7
  2. 99820
  3. 900
  4. 90
  5. 30
  6. 97.1
  7. 20
  8. 15000
  9. 81.6
  10. 8000
  11. 1700
  12. 71000
  13. 72000
  14. 83000
  15. 82.4
  16. 2200
  17. 71.3
  18. 48.8
  19. 40000
  20. 31000
  21. 1900
  22. 28000
  23. 8000
  24. 1000
  25. 1500
  26. 70
  27. 70
  28. 64100
  29. 30
  30. 1100
  31. 48000
  32. 20
  33. 90
  34. 70
  35. 10300
  36. 18000
  37. 1600
  38. 86000
  39. 30
  40. 52.5

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