This is a PowerPoint lesson on units of measurement and finding equivalent measurements. It focuses mainly on customary weight, metric weight, and metric length, but it also briefly discusses customary length. Students will gain an understanding of the different sizes within a system of measurement, choose the most reasonable unit of measurement, and learn some hints for how to remember the size of different units. There is a section of conversion tables to practice converting from one unit to another within the same system of measurement. Information presented is based on Measurement and Data standards for 4th grade.