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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 910 · 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.Round 51.48 to one decimal place. =
  2. 2.Which is closest to 896 + 298 + 704? (a) 2000 (b) 1900 (c) 1800 (d) 2100
  3. 3.Which is closest to 396 + 597 + 505? (a) 1400 (b) 1500 (c) 1600 (d) 1700
  4. 4.Round 75594 to the nearest hundred.
  5. 5.Round 20249 to the nearest thousand.
  6. 6.Round 49208 to the nearest hundred.
  7. 7.Which is closest to 296 × 79? (Round each number first.) (a) 24000 (b) 48000 (c) 240000 (d) 2400
  8. 8.Which is closest to 1808 ÷ 19? (a) 180 (b) 45 (c) 900 (d) 90
  9. 9.Round 52.66 to one decimal place. =
  10. 10.Which is closest to 2496 ÷ 49? (a) 100 (b) 25 (c) 500 (d) 50
  11. 11.Which is closest to 596 + 801 + 497? (a) 1800 (b) 2000 (c) 1900 (d) 2100
  12. 12.Round 94637 to the nearest ten.
  13. 13.Round 23.54 to one decimal place. =
  14. 14.Round 64.17 to one decimal place. =
  15. 15.Which is closest to 504 × 62? (Round each number first.) (a) 60000 (b) 3000 (c) 30000 (d) 300000
  16. 16.Round 28036 to the nearest thousand.
  17. 17.Which is closest to 800 × 91? (Round each number first.) (a) 72000 (b) 720000 (c) 7200 (d) 144000
  18. 18.Which is closest to 297 × 92? (Round each number first.) (a) 54000 (b) 270000 (c) 2700 (d) 27000
  19. 19.Which is closest to 504 + 496 + 296? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  20. 20.Which is closest to 1804 ÷ 31? (a) 120 (b) 30 (c) 60 (d) 600
  21. 21.Which is closest to 797 + 698 + 500? (a) 2200 (b) 2000 (c) 1900 (d) 2100
  22. 22.Which is closest to 503 × 70? (Round each number first.) (a) 35000 (b) 3500 (c) 350000 (d) 70000
  23. 23.Which is closest to 304 + 100 + 598? (a) 1100 (b) 900 (c) 1200 (d) 1000
  24. 24.Which is closest to 1593 ÷ 19? (a) 800 (b) 80 (c) 40 (d) 160
  25. 25.Which is closest to 891 ÷ 31? (a) 300 (b) 30 (c) 60 (d) 15
  26. 26.Which is closest to 1607 ÷ 21? (a) 80 (b) 40 (c) 160 (d) 800
  27. 27.Round 53493 to the nearest thousand.
  28. 28.Round 24.64 to one decimal place. =
  29. 29.Round 20.82 to one decimal place. =
  30. 30.Round 24.33 to one decimal place. =
  31. 31.Round 61.66 to one decimal place. =
  32. 32.Which is closest to 1492 ÷ 49? (a) 300 (b) 60 (c) 15 (d) 30
  33. 33.Which is closest to 697 × 88? (Round each number first.) (a) 630000 (b) 6300 (c) 126000 (d) 63000
  34. 34.Round 52.89 to one decimal place. =
  35. 35.Round 59.63 to one decimal place. =
  36. 36.Which is closest to 901 + 797 + 696? (a) 2400 (b) 2600 (c) 2500 (d) 2300
  37. 37.Which is closest to 899 + 100 + 296? (a) 1500 (b) 1300 (c) 1200 (d) 1400
  38. 38.Which is closest to 797 × 29? (Round each number first.) (a) 48000 (b) 24000 (c) 2400 (d) 240000
  39. 39.Round 62.52 to one decimal place. =
  40. 40.Which is closest to 606 ÷ 19? (a) 300 (b) 60 (c) 15 (d) 30

Answer key

  1. 51.5
  2. 1900
  3. 1500
  4. 75600
  5. 20000
  6. 49200
  7. 24000
  8. 90
  9. 52.7
  10. 50
  11. 1900
  12. 94640
  13. 23.5
  14. 64.2
  15. 30000
  16. 28000
  17. 72000
  18. 27000
  19. 1300
  20. 60
  21. 2000
  22. 35000
  23. 1000
  24. 80
  25. 30
  26. 80
  27. 53000
  28. 24.6
  29. 20.8
  30. 24.3
  31. 61.7
  32. 30
  33. 63000
  34. 52.9
  35. 59.6
  36. 2400
  37. 1300
  38. 24000
  39. 62.5
  40. 30

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