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一年级数学下册第2单元《20以内的退位减法》《用减法解决实际问题》习题课件新人教版.ppt

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用减法解决实际问题,1.,知识点,从总数里去掉一部分，求剩下部分用减法,还有几本没有收到？, (本),13,6,7,2.,还剩几个？, (个),12,7,5,3.下面是博士文具店昨天销售的文具情况。,易错点,8个,4个,4支,辨析：不懂表格，不能提取有效信息解决问题。,4.一共有15只鸡。,收集不同的信息提出不同的问题,(1)右边有7只，左边有几只？, (只),15,7,8,(2)公鸡有6只，母鸡有几只？, (只),15,6,9,

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