Now, let's deal with conversion problems. If you are already familiar with doing calculations using conversion factors, feel free to move on to the next topic ("Density Conversions"). Your score on the "Conversion Calculations Pretest" should give you a good idea of your ability to do these kinds of calculations. Or try the Quick Quizzes under "Metric Conversions" and "Conversions between Metric and American Units" and then decide whether to move on.