This site has a great collection of Math Vocabulary cards to feature during your Math Workshop time. I'm planning to place mine on a ring and hang near my large group area for review (if I don't see it, I don't remember it!). Also, I have a grand vision of a Math Vocabulary Word Wall in a pocket chart.
Sigh... I heart pocket charts.
Anyway, check it out and save it to your math files! They have cards for K-5th grade.
Happy Math Talk!