The rigor on the math state standardized test has risen, mostly in the area of vocabulary. Students are not just responsible for knowing how to solve a problem, but they must know the meaning of the vocabulary used in order to do so. I created these flash cards for my students to practice with during our guided math centers. This could be used during a math by myself or math with someone center. You can add the words as you teach them so students aren't working with words that have yet to be taught, or they can be used as a review later in the year. I printed these on cardstock and laminated them so they will hold up longer!