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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 270 · 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 3003 ÷ 49? (a) 60 (b) 600 (c) 30 (d) 120
  2. 2.Which is closest to 2000 ÷ 41? (a) 100 (b) 500 (c) 25 (d) 50
  3. 3.Which is closest to 1193 ÷ 19? (a) 30 (b) 60 (c) 600 (d) 120
  4. 4.Which is closest to 903 + 304 + 297? (a) 1400 (b) 1600 (c) 1700 (d) 1500
  5. 5.Round 22.77 to one decimal place. =
  6. 6.Which is closest to 899 + 500 + 895? (a) 2500 (b) 2300 (c) 2400 (d) 2200
  7. 7.Round 98.18 to one decimal place. =
  8. 8.Round 20.34 to one decimal place. =
  9. 9.Which is closest to 1198 ÷ 39? (a) 15 (b) 300 (c) 30 (d) 60
  10. 10.Round 38678 to the nearest thousand.
  11. 11.Round 88876 to the nearest hundred.
  12. 12.Round 30697 to the nearest ten.
  13. 13.Round 70.12 to one decimal place. =
  14. 14.Which is closest to 399 + 803 + 100? (a) 1200 (b) 1400 (c) 1300 (d) 1500
  15. 15.Which is closest to 804 + 504 + 803? (a) 2000 (b) 2200 (c) 2300 (d) 2100
  16. 16.Round 35.16 to one decimal place. =
  17. 17.Which is closest to 2694 ÷ 29? (a) 900 (b) 90 (c) 45 (d) 180
  18. 18.Which is closest to 2009 ÷ 39? (a) 100 (b) 500 (c) 50 (d) 25
  19. 19.Which is closest to 3595 ÷ 39? (a) 180 (b) 900 (c) 45 (d) 90
  20. 20.Which is closest to 806 ÷ 39? (a) 20 (b) 10 (c) 200 (d) 40
  21. 21.Which is closest to 807 ÷ 21? (a) 20 (b) 80 (c) 40 (d) 400
  22. 22.Which is closest to 97 + 404 + 496? (a) 1200 (b) 900 (c) 1100 (d) 1000
  23. 23.Round 12.47 to one decimal place. =
  24. 24.Which is closest to 703 × 50? (Round each number first.) (a) 3500 (b) 70000 (c) 350000 (d) 35000
  25. 25.Which is closest to 303 × 32? (Round each number first.) (a) 90000 (b) 900 (c) 18000 (d) 9000
  26. 26.Round 55552 to the nearest hundred.
  27. 27.Which is closest to 197 + 202 + 296? (a) 800 (b) 700 (c) 600 (d) 900
  28. 28.Which is closest to 596 × 88? (Round each number first.) (a) 540000 (b) 54000 (c) 5400 (d) 108000
  29. 29.Round 95758 to the nearest hundred.
  30. 30.Round 25.27 to one decimal place. =
  31. 31.Round 5121 to the nearest thousand.
  32. 32.Which is closest to 302 + 297 + 197? (a) 1000 (b) 900 (c) 700 (d) 800
  33. 33.Which is closest to 505 + 797 + 605? (a) 1900 (b) 2100 (c) 2000 (d) 1800
  34. 34.Which is closest to 602 × 90? (Round each number first.) (a) 5400 (b) 54000 (c) 108000 (d) 540000
  35. 35.Which is closest to 2492 ÷ 49? (a) 25 (b) 50 (c) 500 (d) 100
  36. 36.Which is closest to 300 + 403 + 898? (a) 1600 (b) 1800 (c) 1500 (d) 1700
  37. 37.Round 26028 to the nearest hundred.
  38. 38.Which is closest to 904 + 600 + 304? (a) 1700 (b) 1900 (c) 2000 (d) 1800
  39. 39.Round 63.11 to one decimal place. =
  40. 40.Which is closest to 301 × 70? (Round each number first.) (a) 21000 (b) 42000 (c) 210000 (d) 2100

Answer key

  1. 60
  2. 50
  3. 60
  4. 1500
  5. 22.8
  6. 2300
  7. 98.2
  8. 20.3
  9. 30
  10. 39000
  11. 88900
  12. 30700
  13. 70.1
  14. 1300
  15. 2100
  16. 35.2
  17. 90
  18. 50
  19. 90
  20. 20
  21. 40
  22. 1000
  23. 12.5
  24. 35000
  25. 9000
  26. 55600
  27. 700
  28. 54000
  29. 95800
  30. 25.3
  31. 5000
  32. 800
  33. 1900
  34. 54000
  35. 50
  36. 1600
  37. 26000
  38. 1800
  39. 63.1
  40. 21000

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