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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 407 · 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 801 × 21? (Round each number first.) (a) 32000 (b) 160000 (c) 16000 (d) 1600
  2. 2.Which is closest to 603 × 32? (Round each number first.) (a) 36000 (b) 18000 (c) 180000 (d) 1800
  3. 3.Round 72.79 to one decimal place. =
  4. 4.Round 44.42 to one decimal place. =
  5. 5.Round 19.52 to one decimal place. =
  6. 6.Which is closest to 2392 ÷ 29? (a) 160 (b) 80 (c) 40 (d) 800
  7. 7.Which is closest to 500 + 300 + 795? (a) 1500 (b) 1800 (c) 1700 (d) 1600
  8. 8.Round 47825 to the nearest thousand.
  9. 9.Which is closest to 198 × 62? (Round each number first.) (a) 24000 (b) 12000 (c) 120000 (d) 1200
  10. 10.Which is closest to 696 + 696 + 898? (a) 2300 (b) 2400 (c) 2500 (d) 2200
  11. 11.Which is closest to 902 × 32? (Round each number first.) (a) 270000 (b) 54000 (c) 2700 (d) 27000
  12. 12.Which is closest to 503 × 28? (Round each number first.) (a) 30000 (b) 15000 (c) 1500 (d) 150000
  13. 13.Round 55682 to the nearest thousand.
  14. 14.Which is closest to 700 × 92? (Round each number first.) (a) 6300 (b) 630000 (c) 126000 (d) 63000
  15. 15.Which is closest to 1998 ÷ 49? (a) 40 (b) 20 (c) 80 (d) 400
  16. 16.Round 25910 to the nearest hundred.
  17. 17.Round 92797 to the nearest thousand.
  18. 18.Round 50.43 to one decimal place. =
  19. 19.Round 69735 to the nearest hundred.
  20. 20.Which is closest to 896 + 295 + 495? (a) 1900 (b) 1700 (c) 1800 (d) 1600
  21. 21.Which is closest to 2500 ÷ 49? (a) 500 (b) 25 (c) 100 (d) 50
  22. 22.Round 88.82 to one decimal place. =
  23. 23.Round 75393 to the nearest ten.
  24. 24.Round 36.33 to one decimal place. =
  25. 25.Which is closest to 603 ÷ 29? (a) 40 (b) 10 (c) 200 (d) 20
  26. 26.Which is closest to 899 + 696 + 896? (a) 2700 (b) 2600 (c) 2400 (d) 2500
  27. 27.Which is closest to 799 + 296 + 496? (a) 1500 (b) 1600 (c) 1800 (d) 1700
  28. 28.Round 76894 to the nearest ten.
  29. 29.Round 32249 to the nearest thousand.
  30. 30.Which is closest to 900 × 69? (Round each number first.) (a) 630000 (b) 6300 (c) 126000 (d) 63000
  31. 31.Round 67916 to the nearest ten.
  32. 32.Which is closest to 297 × 48? (Round each number first.) (a) 150000 (b) 1500 (c) 15000 (d) 30000
  33. 33.Which is closest to 796 × 82? (Round each number first.) (a) 128000 (b) 64000 (c) 640000 (d) 6400
  34. 34.Which is closest to 2806 ÷ 39? (a) 140 (b) 70 (c) 700 (d) 35
  35. 35.Which is closest to 797 + 404 + 102? (a) 1500 (b) 1400 (c) 1300 (d) 1200
  36. 36.Which is closest to 897 ÷ 31? (a) 300 (b) 15 (c) 60 (d) 30
  37. 37.Which is closest to 594 ÷ 29? (a) 10 (b) 40 (c) 200 (d) 20
  38. 38.Round 28701 to the nearest ten.
  39. 39.Round 2762 to the nearest thousand.
  40. 40.Which is closest to 896 + 195 + 100? (a) 1200 (b) 1300 (c) 1400 (d) 1100

Answer key

  1. 16000
  2. 18000
  3. 72.8
  4. 44.4
  5. 19.5
  6. 80
  7. 1600
  8. 48000
  9. 12000
  10. 2300
  11. 27000
  12. 15000
  13. 56000
  14. 63000
  15. 40
  16. 25900
  17. 93000
  18. 50.4
  19. 69700
  20. 1700
  21. 50
  22. 88.8
  23. 75390
  24. 36.3
  25. 20
  26. 2500
  27. 1600
  28. 76890
  29. 32000
  30. 63000
  31. 67920
  32. 15000
  33. 64000
  34. 70
  35. 1300
  36. 30
  37. 20
  38. 28700
  39. 3000
  40. 1200

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