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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 878 · 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 28149 to the nearest hundred.
  2. 2.Which is closest to 1506 ÷ 29? (a) 100 (b) 25 (c) 50 (d) 500
  3. 3.Which is closest to 1605 ÷ 39? (a) 400 (b) 80 (c) 20 (d) 40
  4. 4.Which is closest to 496 × 62? (Round each number first.) (a) 30000 (b) 3000 (c) 60000 (d) 300000
  5. 5.Which is closest to 1209 ÷ 29? (a) 400 (b) 20 (c) 80 (d) 40
  6. 6.Round 50.79 to one decimal place. =
  7. 7.Round 41959 to the nearest hundred.
  8. 8.Which is closest to 1206 ÷ 41? (a) 15 (b) 300 (c) 60 (d) 30
  9. 9.Round 86.82 to one decimal place. =
  10. 10.Which is closest to 205 + 903 + 102? (a) 1100 (b) 1200 (c) 1400 (d) 1300
  11. 11.Which is closest to 196 + 505 + 599? (a) 1200 (b) 1500 (c) 1300 (d) 1400
  12. 12.Which is closest to 894 ÷ 31? (a) 15 (b) 300 (c) 60 (d) 30
  13. 13.Round 28.38 to one decimal place. =
  14. 14.Which is closest to 698 × 49? (Round each number first.) (a) 70000 (b) 350000 (c) 35000 (d) 3500
  15. 15.Round 45.17 to one decimal place. =
  16. 16.Which is closest to 596 ÷ 29? (a) 10 (b) 200 (c) 20 (d) 40
  17. 17.Round 98449 to the nearest hundred.
  18. 18.Which is closest to 201 × 70? (Round each number first.) (a) 28000 (b) 140000 (c) 1400 (d) 14000
  19. 19.Which is closest to 197 × 79? (Round each number first.) (a) 160000 (b) 16000 (c) 1600 (d) 32000
  20. 20.Round 16.73 to one decimal place. =
  21. 21.Which is closest to 497 × 69? (Round each number first.) (a) 35000 (b) 70000 (c) 3500 (d) 350000
  22. 22.Round 83.61 to one decimal place. =
  23. 23.Round 84123 to the nearest thousand.
  24. 24.Round 94061 to the nearest ten.
  25. 25.Round 21874 to the nearest hundred.
  26. 26.Which is closest to 401 + 196 + 605? (a) 1200 (b) 1100 (c) 1400 (d) 1300
  27. 27.Round 45.42 to one decimal place. =
  28. 28.Which is closest to 1206 ÷ 39? (a) 60 (b) 300 (c) 15 (d) 30
  29. 29.Round 45.57 to one decimal place. =
  30. 30.Round 4610 to the nearest thousand.
  31. 31.Which is closest to 898 × 31? (Round each number first.) (a) 270000 (b) 2700 (c) 54000 (d) 27000
  32. 32.Which is closest to 96 + 800 + 895? (a) 1700 (b) 1900 (c) 2000 (d) 1800
  33. 33.Which is closest to 798 × 19? (Round each number first.) (a) 32000 (b) 160000 (c) 16000 (d) 1600
  34. 34.Which is closest to 1793 ÷ 19? (a) 900 (b) 180 (c) 45 (d) 90
  35. 35.Round 18.36 to one decimal place. =
  36. 36.Round 27.89 to one decimal place. =
  37. 37.Which is closest to 304 + 604 + 503? (a) 1600 (b) 1400 (c) 1300 (d) 1500
  38. 38.Round 17.72 to one decimal place. =
  39. 39.Which is closest to 1207 ÷ 31? (a) 40 (b) 80 (c) 20 (d) 400
  40. 40.Round 89.49 to one decimal place. =

Answer key

  1. 28100
  2. 50
  3. 40
  4. 30000
  5. 40
  6. 50.8
  7. 42000
  8. 30
  9. 86.8
  10. 1200
  11. 1300
  12. 30
  13. 28.4
  14. 35000
  15. 45.2
  16. 20
  17. 98400
  18. 14000
  19. 16000
  20. 16.7
  21. 35000
  22. 83.6
  23. 84000
  24. 94060
  25. 21900
  26. 1200
  27. 45.4
  28. 30
  29. 45.6
  30. 5000
  31. 27000
  32. 1800
  33. 16000
  34. 90
  35. 18.4
  36. 27.9
  37. 1400
  38. 17.7
  39. 40
  40. 89.5

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