Can let children know scores, learn scores, understand the relationship between part and the whole, enhance the concept of combination. Guide children to score the addition and subtraction of the operation, to deepen the child's awareness of the score, enrich the knowledge of mathematics. The teaching consists of 5 groups of rounds, respectively, divided into 2,3,4,5,6, and a printed angle and score of the small wooden plate. Consist of 23 round score plate and a double-sided nail plate composition.To understand the scores, understand the relationship between part and the whole, and enhance the concept of combination. The use of nail plate back, with two long and short, different color rubber band, can play children's imagination and creativity. Instructions: The angle of the circle after division, and the relationship between the fraction and the angle.