The classroom is set up into 6-12 centers that have a set of expressions in numeric form and word form. Along with the guide sheet, the students travel to each colored set of cards and match the expressions learning how to read and pronounce expressions. An answer key is provided for the guide sheet which then gives answers to each of the six centers. Students can practice reading expressions with each other. Sets include using squares, square roots, addition, subtraction, multiplication and division situations along with the variable x.