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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 687 · 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 999 ÷ 49? (a) 40 (b) 200 (c) 10 (d) 20
  2. 2.Which is closest to 909 ÷ 29? (a) 300 (b) 15 (c) 60 (d) 30
  3. 3.Which is closest to 807 ÷ 21? (a) 400 (b) 80 (c) 20 (d) 40
  4. 4.Round 72237 to the nearest ten.
  5. 5.Round 47.39 to one decimal place. =
  6. 6.Round 99004 to the nearest ten.
  7. 7.Round 20822 to the nearest ten.
  8. 8.Round 90.43 to one decimal place. =
  9. 9.Which is closest to 3505 ÷ 51? (a) 700 (b) 70 (c) 140 (d) 35
  10. 10.Which is closest to 796 + 901 + 201? (a) 1900 (b) 2000 (c) 1800 (d) 2100
  11. 11.Which is closest to 701 × 48? (Round each number first.) (a) 70000 (b) 35000 (c) 3500 (d) 350000
  12. 12.Which is closest to 497 + 405 + 803? (a) 1900 (b) 1600 (c) 1800 (d) 1700
  13. 13.Which is closest to 600 ÷ 31? (a) 200 (b) 40 (c) 10 (d) 20
  14. 14.Which is closest to 301 × 42? (Round each number first.) (a) 24000 (b) 12000 (c) 1200 (d) 120000
  15. 15.Which is closest to 104 + 303 + 199? (a) 700 (b) 800 (c) 600 (d) 500
  16. 16.Round 26.84 to one decimal place. =
  17. 17.Which is closest to 795 + 903 + 201? (a) 1800 (b) 2000 (c) 2100 (d) 1900
  18. 18.Round 2090 to the nearest thousand.
  19. 19.Which is closest to 701 + 801 + 395? (a) 2100 (b) 2000 (c) 1900 (d) 1800
  20. 20.Round 3782 to the nearest thousand.
  21. 21.Round 60.42 to one decimal place. =
  22. 22.Which is closest to 704 × 21? (Round each number first.) (a) 140000 (b) 28000 (c) 1400 (d) 14000
  23. 23.Which is closest to 904 + 496 + 501? (a) 2000 (b) 1800 (c) 1900 (d) 2100
  24. 24.Round 96.87 to one decimal place. =
  25. 25.Which is closest to 199 + 104 + 296? (a) 500 (b) 600 (c) 800 (d) 700
  26. 26.Which is closest to 496 × 89? (Round each number first.) (a) 45000 (b) 4500 (c) 90000 (d) 450000
  27. 27.Round 29436 to the nearest ten.
  28. 28.Round 29.06 to one decimal place. =
  29. 29.Round 95522 to the nearest thousand.
  30. 30.Round 42.63 to one decimal place. =
  31. 31.Round 52823 to the nearest ten.
  32. 32.Which is closest to 105 + 102 + 395? (a) 700 (b) 800 (c) 500 (d) 600
  33. 33.Round 58818 to the nearest hundred.
  34. 34.Round 49168 to the nearest ten.
  35. 35.Round 52.79 to one decimal place. =
  36. 36.Which is closest to 498 × 18? (Round each number first.) (a) 1000 (b) 10000 (c) 100000 (d) 20000
  37. 37.Round 31.77 to one decimal place. =
  38. 38.Which is closest to 705 + 297 + 598? (a) 1600 (b) 1700 (c) 1800 (d) 1500
  39. 39.Round 46311 to the nearest hundred.
  40. 40.Which is closest to 600 + 198 + 903? (a) 1900 (b) 1600 (c) 1700 (d) 1800

Answer key

  1. 20
  2. 30
  3. 40
  4. 72240
  5. 47.4
  6. 99000
  7. 20820
  8. 90.4
  9. 70
  10. 1900
  11. 35000
  12. 1700
  13. 20
  14. 12000
  15. 600
  16. 26.8
  17. 1900
  18. 2000
  19. 1900
  20. 4000
  21. 60.4
  22. 14000
  23. 1900
  24. 96.9
  25. 600
  26. 45000
  27. 29440
  28. 29.1
  29. 96000
  30. 42.6
  31. 52820
  32. 600
  33. 58800
  34. 49170
  35. 52.8
  36. 10000
  37. 31.8
  38. 1600
  39. 46300
  40. 1700

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