CenterStage Math Grade 2 Centers. Center-Stage Math Grade 2 Classroom Package: Number Sense & Place Value Center; Addition & Subtraction Center; Geometry & Measurement Center; Problem Solving, Graphing, & Algebra Center; Multiplication, Division Readiness, & Fraction Center. Each center contains 24 activity cards, corresponding brightly-colored manipulatives, study carrel, teacher's notes, teacher's resource guide and a metal storage rack