- A NEW classroom center complete with all the materials needed to teach fractions to a full class or third or fourth graders. Includes 10 sets of Fraction Bars, 7 sets of Fraction Playing Cards, Fraction Bars Teacher's Guide Grades 3-4, Fraction Bars Teacher Resource Package Grades 3-4, 30 activity mats, 49 transparencies, and 200 game markers. Comes with a convenient carrying/storage case for all these materials. Grades 3-4.