【教材背景】对学龄初期的儿童,同数相加式题(如5+5=?,?+6=12,?+?=18等)具有一定的特殊性,儿童表现出格外的兴趣和记忆,而且这类知识对学生的后续学习有一定的影响(比如乘法是作为同数相加的简便表征来引入的)。但考察目前国内通用版本教材,没有安排专门的针对同数相加的例题教学,在练习中又时常出现各种变式, 【Textbook】 For children of early school age, children with the same number of addition expressions (such as 5 +5 = ?,? +6 = 12,? +? = 18, etc.) have certain particularities, children show special interest and memory , And this kind of knowledge has a certain impact on students’ subsequent learning (for example, multiplication is introduced as a simple characterization of the same number of additions). However, the study of the current domestic version of the textbook, did not arrange a specific example for the same number of teaching, practice and often appear in a variety of variants,