NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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How is PPM converted to percentage strength?

Move decimal LEFT 4 places
Move decimal RIGHT 4 places
Move decimal LEFT 2 places
Move decimal RIGHT 2 places

The correct answer is: Move decimal LEFT 4 places

PPM stands for parts per million and it is a unit of measurement used to express the concentration of a substance in a solution or mixture. This measurement can also be expressed as a percentage strength, which is the amount of the substance compared to the total amount of the solution. To convert PPM to percentage strength, the decimal needs to be moved LEFT 4 places because a percentage is a proportion out of 100, which is represented by moving the decimal two additional places to the left. The other options are incorrect because they either do not move the decimal enough spaces or they move it in the wrong direction, resulting in an incorrect percentage strength.