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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 182 · 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 297 + 203 + 104? (a) 700 (b) 800 (c) 500 (d) 600
  2. 2.Round 53.74 to one decimal place. =
  3. 3.Which is closest to 400 × 22? (Round each number first.) (a) 800 (b) 16000 (c) 80000 (d) 8000
  4. 4.Round 84.18 to one decimal place. =
  5. 5.Round 52903 to the nearest thousand.
  6. 6.Which is closest to 500 × 29? (Round each number first.) (a) 1500 (b) 150000 (c) 30000 (d) 15000
  7. 7.Round 49.66 to one decimal place. =
  8. 8.Which is closest to 502 + 199 + 800? (a) 1400 (b) 1500 (c) 1600 (d) 1700
  9. 9.Round 20.22 to one decimal place. =
  10. 10.Which is closest to 809 ÷ 21? (a) 80 (b) 20 (c) 400 (d) 40
  11. 11.Which is closest to 700 × 68? (Round each number first.) (a) 49000 (b) 490000 (c) 98000 (d) 4900
  12. 12.Which is closest to 799 + 897 + 205? (a) 2100 (b) 1800 (c) 2000 (d) 1900
  13. 13.Which is closest to 403 × 80? (Round each number first.) (a) 32000 (b) 64000 (c) 320000 (d) 3200
  14. 14.Which is closest to 805 + 395 + 402? (a) 1500 (b) 1800 (c) 1700 (d) 1600
  15. 15.Which is closest to 800 ÷ 21? (a) 20 (b) 400 (c) 40 (d) 80
  16. 16.Round 11.61 to one decimal place. =
  17. 17.Round 27.54 to one decimal place. =
  18. 18.Which is closest to 303 + 697 + 397? (a) 1400 (b) 1500 (c) 1300 (d) 1600
  19. 19.Which is closest to 404 × 69? (Round each number first.) (a) 2800 (b) 280000 (c) 28000 (d) 56000
  20. 20.Which is closest to 704 × 59? (Round each number first.) (a) 84000 (b) 4200 (c) 42000 (d) 420000
  21. 21.Round 2455 to the nearest hundred.
  22. 22.Round 75.87 to one decimal place. =
  23. 23.Which is closest to 1407 ÷ 19? (a) 700 (b) 70 (c) 35 (d) 140
  24. 24.Which is closest to 503 + 905 + 498? (a) 1800 (b) 2100 (c) 2000 (d) 1900
  25. 25.Which is closest to 1600 ÷ 41? (a) 40 (b) 400 (c) 20 (d) 80
  26. 26.Round 21.93 to one decimal place. =
  27. 27.Which is closest to 704 × 42? (Round each number first.) (a) 280000 (b) 28000 (c) 2800 (d) 56000
  28. 28.Round 77891 to the nearest hundred.
  29. 29.Which is closest to 2404 ÷ 41? (a) 30 (b) 600 (c) 60 (d) 120
  30. 30.Round 53167 to the nearest ten.
  31. 31.Which is closest to 505 + 695 + 297? (a) 1700 (b) 1600 (c) 1400 (d) 1500
  32. 32.Round 10273 to the nearest hundred.
  33. 33.Round 7988 to the nearest ten.
  34. 34.Round 35.49 to one decimal place. =
  35. 35.Round 27891 to the nearest hundred.
  36. 36.Which is closest to 697 + 900 + 703? (a) 2500 (b) 2200 (c) 2300 (d) 2400
  37. 37.Which is closest to 1802 ÷ 19? (a) 900 (b) 180 (c) 90 (d) 45
  38. 38.Round 59.22 to one decimal place. =
  39. 39.Round 46558 to the nearest ten.
  40. 40.Round 24997 to the nearest thousand.

Answer key

  1. 600
  2. 53.7
  3. 8000
  4. 84.2
  5. 53000
  6. 15000
  7. 49.7
  8. 1500
  9. 20.2
  10. 40
  11. 49000
  12. 1900
  13. 32000
  14. 1600
  15. 40
  16. 11.6
  17. 27.5
  18. 1400
  19. 28000
  20. 42000
  21. 2500
  22. 75.9
  23. 70
  24. 1900
  25. 40
  26. 21.9
  27. 28000
  28. 77900
  29. 60
  30. 53170
  31. 1500
  32. 10300
  33. 7990
  34. 35.5
  35. 27900
  36. 2300
  37. 90
  38. 59.2
  39. 46560
  40. 25000

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