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20以内的进位加法，是继10以内数的加减法和11～20各数的认识之后进行教学的。其中，数的组成和口算连加是本单元学习“凑十法”的认知基础。因为教材采用适当分组的方法编排、教学，于是9加几的学习就成为发现凑十规律寻求计算方法的起点。所以学好“9加几”，引导学生探索规
Carrying addition within 20 is followed by the addition and subtraction within the number of 10 and the number of 11 to 20 after the recognition of teaching. Among them, the number of the composition and the mouth count together plus the unit to learn the “get ten” cognitive basis. Because the textbooks are organized and taught in an appropriate grouping, the learning curve becomes the starting point for discovering the ten laws to find a solution. So learn “9 plus a few”, to guide students to explore rules