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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 178 · 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 502 × 60? (Round each number first.) (a) 3000 (b) 30000 (c) 60000 (d) 300000
  2. 2.Round 56.67 to one decimal place. =
  3. 3.Which is closest to 399 × 42? (Round each number first.) (a) 1600 (b) 160000 (c) 32000 (d) 16000
  4. 4.Round 82047 to the nearest thousand.
  5. 5.Round 3435 to the nearest hundred.
  6. 6.Which is closest to 397 × 29? (Round each number first.) (a) 24000 (b) 12000 (c) 120000 (d) 1200
  7. 7.Round 15.78 to one decimal place. =
  8. 8.Round 41.79 to one decimal place. =
  9. 9.Round 11047 to the nearest thousand.
  10. 10.Which is closest to 1394 ÷ 19? (a) 35 (b) 700 (c) 70 (d) 140
  11. 11.Which is closest to 502 + 596 + 697? (a) 1700 (b) 2000 (c) 1800 (d) 1900
  12. 12.Which is closest to 601 × 18? (Round each number first.) (a) 12000 (b) 24000 (c) 1200 (d) 120000
  13. 13.Which is closest to 1797 ÷ 19? (a) 180 (b) 90 (c) 45 (d) 900
  14. 14.Which is closest to 1799 ÷ 19? (a) 900 (b) 180 (c) 45 (d) 90
  15. 15.Round 85.28 to one decimal place. =
  16. 16.Round 48.27 to one decimal place. =
  17. 17.Round 21.69 to one decimal place. =
  18. 18.Which is closest to 897 + 295 + 803? (a) 2200 (b) 2000 (c) 1900 (d) 2100
  19. 19.Round 4848 to the nearest ten.
  20. 20.Round 19449 to the nearest hundred.
  21. 21.Which is closest to 2797 ÷ 39? (a) 35 (b) 140 (c) 700 (d) 70
  22. 22.Which is closest to 701 × 49? (Round each number first.) (a) 70000 (b) 350000 (c) 3500 (d) 35000
  23. 23.Which is closest to 704 × 70? (Round each number first.) (a) 98000 (b) 49000 (c) 4900 (d) 490000
  24. 24.Which is closest to 900 ÷ 31? (a) 30 (b) 300 (c) 15 (d) 60
  25. 25.Which is closest to 1192 ÷ 21? (a) 60 (b) 600 (c) 30 (d) 120
  26. 26.Round 7036 to the nearest ten.
  27. 27.Round 40858 to the nearest thousand.
  28. 28.Which is closest to 397 × 39? (Round each number first.) (a) 1600 (b) 32000 (c) 160000 (d) 16000
  29. 29.Round 33.54 to one decimal place. =
  30. 30.Which is closest to 895 + 897 + 197? (a) 1900 (b) 2200 (c) 2100 (d) 2000
  31. 31.Which is closest to 699 × 62? (Round each number first.) (a) 4200 (b) 84000 (c) 42000 (d) 420000
  32. 32.Which is closest to 301 + 96 + 904? (a) 1300 (b) 1200 (c) 1400 (d) 1500
  33. 33.Which is closest to 897 × 19? (Round each number first.) (a) 36000 (b) 180000 (c) 18000 (d) 1800
  34. 34.Which is closest to 301 + 401 + 903? (a) 1500 (b) 1700 (c) 1800 (d) 1600
  35. 35.Round 68.57 to one decimal place. =
  36. 36.Round 54.32 to one decimal place. =
  37. 37.Round 28921 to the nearest ten.
  38. 38.Round 44.59 to one decimal place. =
  39. 39.Round 60.67 to one decimal place. =
  40. 40.Which is closest to 196 + 895 + 197? (a) 1400 (b) 1500 (c) 1200 (d) 1300

Answer key

  1. 30000
  2. 56.7
  3. 16000
  4. 82000
  5. 3400
  6. 12000
  7. 15.8
  8. 41.8
  9. 11000
  10. 70
  11. 1800
  12. 12000
  13. 90
  14. 90
  15. 85.3
  16. 48.3
  17. 21.7
  18. 2000
  19. 4850
  20. 19400
  21. 70
  22. 35000
  23. 49000
  24. 30
  25. 60
  26. 7040
  27. 41000
  28. 16000
  29. 33.5
  30. 2000
  31. 42000
  32. 1300
  33. 18000
  34. 1600
  35. 68.6
  36. 54.3
  37. 28920
  38. 44.6
  39. 60.7
  40. 1300

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