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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 458 · 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 95 + 595 + 797? (a) 1600 (b) 1400 (c) 1700 (d) 1500
  2. 2.Round 88867 to the nearest ten.
  3. 3.Round 14.89 to one decimal place. =
  4. 4.Which is closest to 297 × 92? (Round each number first.) (a) 2700 (b) 270000 (c) 27000 (d) 54000
  5. 5.Which is closest to 1206 ÷ 19? (a) 600 (b) 60 (c) 30 (d) 120
  6. 6.Which is closest to 899 + 703 + 896? (a) 2500 (b) 2600 (c) 2700 (d) 2400
  7. 7.Which is closest to 598 × 39? (Round each number first.) (a) 240000 (b) 48000 (c) 24000 (d) 2400
  8. 8.Which is closest to 800 × 61? (Round each number first.) (a) 48000 (b) 96000 (c) 4800 (d) 480000
  9. 9.Which is closest to 805 + 899 + 704? (a) 2400 (b) 2300 (c) 2600 (d) 2500
  10. 10.Round 52.47 to one decimal place. =
  11. 11.Round 97.32 to one decimal place. =
  12. 12.Round 88610 to the nearest hundred.
  13. 13.Round 76030 to the nearest thousand.
  14. 14.Which is closest to 703 + 701 + 595? (a) 2000 (b) 2200 (c) 2100 (d) 1900
  15. 15.Which is closest to 401 + 405 + 297? (a) 1100 (b) 1300 (c) 1200 (d) 1000
  16. 16.Which is closest to 302 × 40? (Round each number first.) (a) 1200 (b) 12000 (c) 120000 (d) 24000
  17. 17.Which is closest to 702 × 42? (Round each number first.) (a) 2800 (b) 280000 (c) 56000 (d) 28000
  18. 18.Round 28.72 to one decimal place. =
  19. 19.Round 90.83 to one decimal place. =
  20. 20.Round 38894 to the nearest hundred.
  21. 21.Which is closest to 497 + 303 + 597? (a) 1500 (b) 1300 (c) 1600 (d) 1400
  22. 22.Which is closest to 503 × 28? (Round each number first.) (a) 30000 (b) 150000 (c) 1500 (d) 15000
  23. 23.Round 63.58 to one decimal place. =
  24. 24.Which is closest to 2002 ÷ 49? (a) 40 (b) 80 (c) 20 (d) 400
  25. 25.Round 79576 to the nearest ten.
  26. 26.Which is closest to 3593 ÷ 41? (a) 180 (b) 900 (c) 45 (d) 90
  27. 27.Which is closest to 500 × 42? (Round each number first.) (a) 200000 (b) 2000 (c) 40000 (d) 20000
  28. 28.Round 27.78 to one decimal place. =
  29. 29.Which is closest to 203 + 499 + 205? (a) 900 (b) 1100 (c) 800 (d) 1000
  30. 30.Round 45.58 to one decimal place. =
  31. 31.Which is closest to 1194 ÷ 41? (a) 300 (b) 15 (c) 60 (d) 30
  32. 32.Which is closest to 902 × 51? (Round each number first.) (a) 4500 (b) 45000 (c) 450000 (d) 90000
  33. 33.Which is closest to 96 + 97 + 496? (a) 900 (b) 800 (c) 700 (d) 600
  34. 34.Round 95.19 to one decimal place. =
  35. 35.Round 85.14 to one decimal place. =
  36. 36.Round 3347 to the nearest thousand.
  37. 37.Round 58.58 to one decimal place. =
  38. 38.Which is closest to 1207 ÷ 19? (a) 120 (b) 600 (c) 30 (d) 60
  39. 39.Round 69558 to the nearest ten.
  40. 40.Round 78.41 to one decimal place. =

Answer key

  1. 1500
  2. 88870
  3. 14.9
  4. 27000
  5. 60
  6. 2500
  7. 24000
  8. 48000
  9. 2400
  10. 52.5
  11. 97.3
  12. 88600
  13. 76000
  14. 2000
  15. 1100
  16. 12000
  17. 28000
  18. 28.7
  19. 90.8
  20. 38900
  21. 1400
  22. 15000
  23. 63.6
  24. 40
  25. 79580
  26. 90
  27. 20000
  28. 27.8
  29. 900
  30. 45.6
  31. 30
  32. 45000
  33. 700
  34. 95.2
  35. 85.1
  36. 3000
  37. 58.6
  38. 60
  39. 69560
  40. 78.4

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