The game is mainly for primary school grade three，corresponding the third grade eighth unit of primary school mathematics of Human education--Initial recognition of fraction. We have learned about ten thousand.Then there is a new problem.Divide an object into 4 parts，how to represent one of them? Thus introduced fraction.Game a total of four off.According to the thinking process of learning，layer upon layer.Let the children play in the learning of knowledge.Little friends, come on to the challenge! QD learn aims at teaching through lively activities and happy learning.