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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 450 · 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 200 + 203 + 300? (a) 800 (b) 900 (c) 700 (d) 600
  2. 2.Round 76201 to the nearest thousand.
  3. 3.Round 85.51 to one decimal place. =
  4. 4.Which is closest to 297 + 905 + 604? (a) 1900 (b) 1700 (c) 2000 (d) 1800
  5. 5.Round 25.84 to one decimal place. =
  6. 6.Which is closest to 405 + 295 + 504? (a) 1300 (b) 1100 (c) 1200 (d) 1400
  7. 7.Which is closest to 296 × 18? (Round each number first.) (a) 6000 (b) 60000 (c) 600 (d) 12000
  8. 8.Round 90.28 to one decimal place. =
  9. 9.Round 40.13 to one decimal place. =
  10. 10.Which is closest to 798 × 22? (Round each number first.) (a) 32000 (b) 16000 (c) 160000 (d) 1600
  11. 11.Which is closest to 696 × 42? (Round each number first.) (a) 56000 (b) 2800 (c) 28000 (d) 280000
  12. 12.Round 73.11 to one decimal place. =
  13. 13.Which is closest to 797 + 199 + 96? (a) 1000 (b) 1200 (c) 1300 (d) 1100
  14. 14.Round 54.84 to one decimal place. =
  15. 15.Round 70710 to the nearest hundred.
  16. 16.Which is closest to 797 × 59? (Round each number first.) (a) 480000 (b) 96000 (c) 48000 (d) 4800
  17. 17.Round 24174 to the nearest thousand.
  18. 18.Which is closest to 1594 ÷ 41? (a) 20 (b) 40 (c) 400 (d) 80
  19. 19.Which is closest to 505 + 901 + 595? (a) 2000 (b) 1900 (c) 2200 (d) 2100
  20. 20.Round 76.49 to one decimal place. =
  21. 21.Round 79.46 to one decimal place. =
  22. 22.Which is closest to 900 × 28? (Round each number first.) (a) 270000 (b) 2700 (c) 27000 (d) 54000
  23. 23.Which is closest to 201 + 802 + 597? (a) 1700 (b) 1800 (c) 1600 (d) 1500
  24. 24.Round 81608 to the nearest thousand.
  25. 25.Which is closest to 901 × 28? (Round each number first.) (a) 270000 (b) 27000 (c) 2700 (d) 54000
  26. 26.Round 17.28 to one decimal place. =
  27. 27.Which is closest to 3596 ÷ 39? (a) 900 (b) 180 (c) 45 (d) 90
  28. 28.Which is closest to 993 ÷ 51? (a) 40 (b) 20 (c) 200 (d) 10
  29. 29.Which is closest to 3502 ÷ 51? (a) 700 (b) 35 (c) 70 (d) 140
  30. 30.Round 56.46 to one decimal place. =
  31. 31.Round 55.37 to one decimal place. =
  32. 32.Which is closest to 196 + 396 + 301? (a) 1100 (b) 1000 (c) 800 (d) 900
  33. 33.Round 44.72 to one decimal place. =
  34. 34.Which is closest to 702 + 597 + 205? (a) 1400 (b) 1600 (c) 1700 (d) 1500
  35. 35.Which is closest to 399 × 90? (Round each number first.) (a) 3600 (b) 36000 (c) 360000 (d) 72000
  36. 36.Which is closest to 899 × 28? (Round each number first.) (a) 27000 (b) 2700 (c) 270000 (d) 54000
  37. 37.Which is closest to 200 + 297 + 102? (a) 700 (b) 800 (c) 600 (d) 500
  38. 38.Round 35138 to the nearest thousand.
  39. 39.Round 3537 to the nearest ten.
  40. 40.Which is closest to 498 × 59? (Round each number first.) (a) 3000 (b) 60000 (c) 300000 (d) 30000

Answer key

  1. 700
  2. 76000
  3. 85.5
  4. 1800
  5. 25.8
  6. 1200
  7. 6000
  8. 90.3
  9. 40.1
  10. 16000
  11. 28000
  12. 73.1
  13. 1100
  14. 54.8
  15. 70700
  16. 48000
  17. 24000
  18. 40
  19. 2000
  20. 76.5
  21. 79.5
  22. 27000
  23. 1600
  24. 82000
  25. 27000
  26. 17.3
  27. 90
  28. 20
  29. 70
  30. 56.5
  31. 55.4
  32. 900
  33. 44.7
  34. 1500
  35. 36000
  36. 27000
  37. 600
  38. 35000
  39. 3540
  40. 30000

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