The 15 self-contained centers in Math Centers, Grades 1—3 are presented in a hanging pocket, a shoe-box, or a folder. The skills practiced include: Hanger Pocket Centers—skip counting, counting puzzles, computation, number families, telling time, word problems Shoebox Centers--calculator puzzles, patterning, linear measure, number names Folder Centers--geometric shapes, math challenges, money, fractions, ordinal numbers