This is a review of dimensional analysis (the metric & English system), significant figures, density, and kelvin temperature conversions.
It is recommended that you work the review sheet first then check your answers and then scroll to the question number that you need help with in the video. You have to practice in chemistry, working the review sheet first will help you to identify what concepts you need to focus on the most while studying.
Learn how to work a problem using dimensional analysis, also called the factor label method. This video works the problems using the English system, a system that you are familiar with to help you get started.