人教版教材在三年级下册第四单元《两位数乘两位数》教学内容的编排中,增加了点子图。教材提供的素材,都是经过教材编写专家精心设计而成,在情境创设上或是在数学知识内部逻辑结构上等方面,都有其合情合理及独到的思考,所以在教学中,首先就是要深入解读教材,领会意图,想想这些素材对新知的学习有什么价值,如何利用才能突显这样的价值。一、使用点子图的意义 People’s Education Edition teaching materials in the third grade under the fourth unit “double-digit by two-digit” teaching content arrangement, an increase of ideas chart. Materials provided by teaching materials are carefully designed by teaching materials experts, in the creation of context or in the mathematical structure of the internal logic, etc., have their reasonable and unique thinking, so in teaching, the first is to go deep Interpretation of textbooks, understand the intent, think of these materials for new learning what value, how to use in order to highlight such a value. First, the use of the meaning of the diagram