数学一上《5以内的减法》（新芽课教案）

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1、数学一上5以内的减法（新芽课教案）数学 学科第 一 册第 三 单元课题：减 法（一）授课教师： 吴 悠教学目标：知识：学生能初步理解减法的意义，认识减号，会读减法算式。能力：学生的观察能力和语言表达能力得到培养。情感：学生学习数学的积极性得到培养。重点：认识减法的意义，正确读减法算式。难点：能准确表述减法算式的意义，会找被减数。教学环节：一。复习铺垫。（3分）小游戏：复习5以内数的分与合。（师生游戏）（设计意图：利用知识的迁移为新知识做铺垫。）二。创设情境，探究新知。（ 15分）（一）初步感知减法的意义，建立减法的概念。1.课件演示课本P26的情景动画图，创设情境导入新课。（引导学生认真观察动

2、画，并自己组织语言如何表述。）2.学生说说收集到的数学信息，并学会提出数学问题。（师根据学生回答的信息板书。）3.理解减法的含义。师：说一说，“飞走了”是什么意思？从几个里面飞走了？小结：从总数里去掉一个部分，求剩下的部分，用减法计算。（板书课题：减法）（二）认识减法算式。1.提问：要求还有几个气球，该怎么列式？（板书：41=3）2.该怎么读这个算式？（讲解减号及读法）（三）进一步理解减法的意义。说一说算式中的“4”“1”和“3”分别表示什么？（设计意图：通过动画情景引入新课，容易激发学生学习兴趣，让学生能够通过自己的观察，收集数学信息、表述信息、提出问题并解决问题。）三。巩固梳理，拓展应用。

3、（ 15分）任务：完成课本P26做一做及P28练习五T3。用“争摘智慧金苹果”的游戏，让学生巩固怎样表述图意及算式意思。（游戏中引导学生明确被减数。）（设计意图：通过游戏的方式让学生练习巩固，可以让课堂练习达到更好的效果。）四。课堂总结。（2分）今天学习了什么内容？减法和我们之前学的加法有什么区别？（设计意图：帮助学生构建知识体系。）C29C91AFE4CED1B6C8795AD9C91AFE4CED1B6C8795AD91AFE4CED1B6C8795AD9C91FE4CED1B6C8795AD29C91AFEDD1B6C87D1B6C8795AD9C91AFE4CED1B6C8795AD9

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