Fraction Calculation Set, 71 Pieces, MAG-Paper This Fraction Calculation Circle Set includes a round board and magnetic pieces that together can form a complete circle, comprising a total of 71 pieces. Each piece represents a fraction of the circle, which is indicated by both text and color. Place the magnetic pieces on the round board to visually demonstrate your fraction calculations. The set is made from MAG-Paper, which consists of 100% recycled paper.