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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 514 · 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 700 + 696 + 601? (a) 2100 (b) 2200 (c) 2000 (d) 1900
  2. 2.Which is closest to 994 ÷ 21? (a) 500 (b) 50 (c) 100 (d) 25
  3. 3.Which is closest to 199 × 42? (Round each number first.) (a) 80000 (b) 8000 (c) 800 (d) 16000
  4. 4.Which is closest to 196 × 21? (Round each number first.) (a) 8000 (b) 4000 (c) 40000 (d) 400
  5. 5.Which is closest to 499 × 42? (Round each number first.) (a) 2000 (b) 20000 (c) 200000 (d) 40000
  6. 6.Which is closest to 100 + 799 + 304? (a) 1100 (b) 1200 (c) 1400 (d) 1300
  7. 7.Round 34986 to the nearest ten.
  8. 8.Which is closest to 3491 ÷ 51? (a) 700 (b) 35 (c) 70 (d) 140
  9. 9.Round 39.78 to one decimal place. =
  10. 10.Which is closest to 502 + 401 + 897? (a) 1800 (b) 2000 (c) 1700 (d) 1900
  11. 11.Which is closest to 299 + 596 + 202? (a) 1100 (b) 1300 (c) 1200 (d) 1000
  12. 12.Round 22.53 to one decimal place. =
  13. 13.Round 28399 to the nearest hundred.
  14. 14.Round 45.74 to one decimal place. =
  15. 15.Which is closest to 1199 ÷ 41? (a) 60 (b) 30 (c) 15 (d) 300
  16. 16.Which is closest to 96 + 301 + 100? (a) 700 (b) 600 (c) 400 (d) 500
  17. 17.Round 53.36 to one decimal place. =
  18. 18.Which is closest to 899 + 602 + 705? (a) 2400 (b) 2100 (c) 2300 (d) 2200
  19. 19.Round 75718 to the nearest thousand.
  20. 20.Round 57.41 to one decimal place. =
  21. 21.Round 67.56 to one decimal place. =
  22. 22.Round 27539 to the nearest thousand.
  23. 23.Which is closest to 903 + 99 + 599? (a) 1700 (b) 1800 (c) 1500 (d) 1600
  24. 24.Which is closest to 4008 ÷ 51? (a) 40 (b) 800 (c) 80 (d) 160
  25. 25.Round 34203 to the nearest hundred.
  26. 26.Round 41075 to the nearest hundred.
  27. 27.Which is closest to 796 × 62? (Round each number first.) (a) 4800 (b) 96000 (c) 480000 (d) 48000
  28. 28.Which is closest to 303 × 69? (Round each number first.) (a) 42000 (b) 21000 (c) 2100 (d) 210000
  29. 29.Which is closest to 594 ÷ 31? (a) 20 (b) 10 (c) 40 (d) 200
  30. 30.Round 38.41 to one decimal place. =
  31. 31.Which is closest to 503 + 195 + 304? (a) 1200 (b) 900 (c) 1100 (d) 1000
  32. 32.Round 58432 to the nearest thousand.
  33. 33.Which is closest to 199 × 18? (Round each number first.) (a) 400 (b) 4000 (c) 40000 (d) 8000
  34. 34.Round 10.81 to one decimal place. =
  35. 35.Round 17.51 to one decimal place. =
  36. 36.Which is closest to 695 + 502 + 496? (a) 1600 (b) 1800 (c) 1700 (d) 1900
  37. 37.Which is closest to 4504 ÷ 51? (a) 90 (b) 900 (c) 45 (d) 180
  38. 38.Which is closest to 900 + 197 + 303? (a) 1300 (b) 1400 (c) 1600 (d) 1500
  39. 39.Which is closest to 805 ÷ 21? (a) 40 (b) 80 (c) 20 (d) 400
  40. 40.Which is closest to 903 × 58? (Round each number first.) (a) 54000 (b) 108000 (c) 5400 (d) 540000

Answer key

  1. 2000
  2. 50
  3. 8000
  4. 4000
  5. 20000
  6. 1200
  7. 34990
  8. 70
  9. 39.8
  10. 1800
  11. 1100
  12. 22.5
  13. 28400
  14. 45.7
  15. 30
  16. 500
  17. 53.4
  18. 2200
  19. 76000
  20. 57.4
  21. 67.6
  22. 28000
  23. 1600
  24. 80
  25. 34200
  26. 41100
  27. 48000
  28. 21000
  29. 20
  30. 38.4
  31. 1000
  32. 58000
  33. 4000
  34. 10.8
  35. 17.5
  36. 1700
  37. 90
  38. 1400
  39. 40
  40. 54000

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