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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 630 · 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 601 × 22? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  2. 2.Round 95716 to the nearest ten.
  3. 3.Round 38.33 to one decimal place. =
  4. 4.Which is closest to 903 × 22? (Round each number first.) (a) 1800 (b) 18000 (c) 180000 (d) 36000
  5. 5.Round 68.08 to one decimal place. =
  6. 6.Round 35.69 to one decimal place. =
  7. 7.Round 26.87 to one decimal place. =
  8. 8.Which is closest to 505 + 97 + 205? (a) 1000 (b) 800 (c) 700 (d) 900
  9. 9.Round 30.57 to one decimal place. =
  10. 10.Which is closest to 302 × 91? (Round each number first.) (a) 54000 (b) 2700 (c) 27000 (d) 270000
  11. 11.Round 20296 to the nearest ten.
  12. 12.Which is closest to 1801 ÷ 29? (a) 60 (b) 120 (c) 30 (d) 600
  13. 13.Round 36.78 to one decimal place. =
  14. 14.Round 11.19 to one decimal place. =
  15. 15.Which is closest to 104 + 896 + 295? (a) 1200 (b) 1400 (c) 1300 (d) 1500
  16. 16.Which is closest to 3493 ÷ 49? (a) 700 (b) 35 (c) 140 (d) 70
  17. 17.Round 19844 to the nearest ten.
  18. 18.Round 84889 to the nearest hundred.
  19. 19.Which is closest to 2398 ÷ 29? (a) 40 (b) 80 (c) 160 (d) 800
  20. 20.Round 78.12 to one decimal place. =
  21. 21.Round 40.79 to one decimal place. =
  22. 22.Which is closest to 903 + 797 + 503? (a) 2100 (b) 2400 (c) 2200 (d) 2300
  23. 23.Which is closest to 504 + 702 + 702? (a) 1900 (b) 2000 (c) 2100 (d) 1800
  24. 24.Which is closest to 296 × 82? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
  25. 25.Which is closest to 499 × 51? (Round each number first.) (a) 50000 (b) 2500 (c) 25000 (d) 250000
  26. 26.Which is closest to 700 × 19? (Round each number first.) (a) 1400 (b) 28000 (c) 14000 (d) 140000
  27. 27.Which is closest to 404 × 18? (Round each number first.) (a) 800 (b) 80000 (c) 16000 (d) 8000
  28. 28.Which is closest to 3207 ÷ 39? (a) 40 (b) 800 (c) 160 (d) 80
  29. 29.Round 20167 to the nearest hundred.
  30. 30.Which is closest to 199 + 696 + 497? (a) 1600 (b) 1400 (c) 1300 (d) 1500
  31. 31.Which is closest to 696 × 91? (Round each number first.) (a) 6300 (b) 126000 (c) 630000 (d) 63000
  32. 32.Round 52.07 to one decimal place. =
  33. 33.Which is closest to 1204 ÷ 41? (a) 60 (b) 300 (c) 30 (d) 15
  34. 34.Which is closest to 403 + 403 + 195? (a) 1000 (b) 900 (c) 1100 (d) 1200
  35. 35.Round 51724 to the nearest hundred.
  36. 36.Which is closest to 3998 ÷ 49? (a) 80 (b) 800 (c) 40 (d) 160
  37. 37.Which is closest to 2999 ÷ 51? (a) 600 (b) 60 (c) 120 (d) 30
  38. 38.Which is closest to 396 × 59? (Round each number first.) (a) 48000 (b) 24000 (c) 240000 (d) 2400
  39. 39.Round 48.77 to one decimal place. =
  40. 40.Round 21.51 to one decimal place. =

Answer key

  1. 12000
  2. 95720
  3. 38.3
  4. 18000
  5. 68.1
  6. 35.7
  7. 26.9
  8. 800
  9. 30.6
  10. 27000
  11. 20300
  12. 60
  13. 36.8
  14. 11.2
  15. 1300
  16. 70
  17. 19840
  18. 84900
  19. 80
  20. 78.1
  21. 40.8
  22. 2200
  23. 1900
  24. 24000
  25. 25000
  26. 14000
  27. 8000
  28. 80
  29. 20200
  30. 1400
  31. 63000
  32. 52.1
  33. 30
  34. 1000
  35. 51700
  36. 80
  37. 60
  38. 24000
  39. 48.8
  40. 21.5

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