The relative atomic mass is the average mass of an atom within a specific sample, irrespective of where that sample came from. Included in this document are five exercises to work through in order to consolidate your understanding of how to calculate the relative atomic mass of a given sample. This is a follow on worksheet from the associated video by NinetyEast : Calculating Relative Atomic Mass and Comparing it with Standard Atomic Weight (available here: http://youtu.be/4LJt1kdbRu8)