This short primer provides the essential information in each of the major math content areas that pre-service and in-service elementary and middle school teachers are expected to know. As a quick reference to math concepts, events, influence, and chronology, this text is an invaluable resource for the classroom teacher who needs help in planning and answering student questions. Based on national standards, this primer provides a strong overview of math concepts, alleviating future teachers from having to re-teach math content, so they can remain focused on the methods.