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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 690 · 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 11.52 to one decimal place. =
  2. 2.Which is closest to 1599 ÷ 41? (a) 80 (b) 40 (c) 20 (d) 400
  3. 3.Which is closest to 4009 ÷ 51? (a) 800 (b) 40 (c) 80 (d) 160
  4. 4.Round 78.64 to one decimal place. =
  5. 5.Round 70993 to the nearest ten.
  6. 6.Which is closest to 1196 ÷ 39? (a) 300 (b) 30 (c) 15 (d) 60
  7. 7.Round 35.26 to one decimal place. =
  8. 8.Which is closest to 503 × 62? (Round each number first.) (a) 60000 (b) 3000 (c) 30000 (d) 300000
  9. 9.Round 96564 to the nearest hundred.
  10. 10.Round 47.46 to one decimal place. =
  11. 11.Which is closest to 896 + 396 + 300? (a) 1800 (b) 1700 (c) 1500 (d) 1600
  12. 12.Round 58957 to the nearest thousand.
  13. 13.Round 51.78 to one decimal place. =
  14. 14.Which is closest to 409 ÷ 19? (a) 200 (b) 10 (c) 40 (d) 20
  15. 15.Round 92034 to the nearest thousand.
  16. 16.Which is closest to 4494 ÷ 51? (a) 45 (b) 180 (c) 900 (d) 90
  17. 17.Which is closest to 901 × 58? (Round each number first.) (a) 540000 (b) 5400 (c) 108000 (d) 54000
  18. 18.Which is closest to 105 + 697 + 699? (a) 1500 (b) 1600 (c) 1400 (d) 1700
  19. 19.Round 22687 to the nearest thousand.
  20. 20.Round 83934 to the nearest ten.
  21. 21.Which is closest to 403 × 68? (Round each number first.) (a) 56000 (b) 280000 (c) 28000 (d) 2800
  22. 22.Which is closest to 297 + 296 + 896? (a) 1400 (b) 1700 (c) 1500 (d) 1600
  23. 23.Which is closest to 798 + 305 + 197? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  24. 24.Round 83857 to the nearest thousand.
  25. 25.Which is closest to 101 + 201 + 596? (a) 1000 (b) 800 (c) 1100 (d) 900
  26. 26.Round 6405 to the nearest hundred.
  27. 27.Which is closest to 603 + 704 + 299? (a) 1800 (b) 1700 (c) 1500 (d) 1600
  28. 28.Which is closest to 804 ÷ 21? (a) 20 (b) 80 (c) 40 (d) 400
  29. 29.Which is closest to 603 × 29? (Round each number first.) (a) 36000 (b) 18000 (c) 1800 (d) 180000
  30. 30.Round 85.44 to one decimal place. =
  31. 31.Round 37.71 to one decimal place. =
  32. 32.Which is closest to 897 + 504 + 498? (a) 2100 (b) 2000 (c) 1800 (d) 1900
  33. 33.Round 70.41 to one decimal place. =
  34. 34.Which is closest to 700 + 105 + 496? (a) 1300 (b) 1500 (c) 1400 (d) 1200
  35. 35.Which is closest to 3005 ÷ 49? (a) 120 (b) 60 (c) 30 (d) 600
  36. 36.Round 18.16 to one decimal place. =
  37. 37.Which is closest to 1501 ÷ 29? (a) 50 (b) 100 (c) 25 (d) 500
  38. 38.Which is closest to 897 × 88? (Round each number first.) (a) 81000 (b) 8100 (c) 162000 (d) 810000
  39. 39.Which is closest to 499 + 596 + 596? (a) 1900 (b) 1600 (c) 1700 (d) 1800
  40. 40.Which is closest to 300 + 902 + 202? (a) 1400 (b) 1300 (c) 1500 (d) 1600

Answer key

  1. 11.5
  2. 40
  3. 80
  4. 78.6
  5. 70990
  6. 30
  7. 35.3
  8. 30000
  9. 96600
  10. 47.5
  11. 1600
  12. 59000
  13. 51.8
  14. 20
  15. 92000
  16. 90
  17. 54000
  18. 1500
  19. 23000
  20. 83930
  21. 28000
  22. 1500
  23. 1300
  24. 84000
  25. 900
  26. 6400
  27. 1600
  28. 40
  29. 18000
  30. 85.4
  31. 37.7
  32. 1900
  33. 70.4
  34. 1300
  35. 60
  36. 18.2
  37. 50
  38. 81000
  39. 1700
  40. 1400

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