一年级数学下册第2单元20以内的退位减法《十几减76》导学案新人教版.doc

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1、12.3 十几减 7 6 1、学习目标:1、学生初步学会计算十几减 7 6。2、使学生通过练习,进一步理解计算退位减法的思考方法。二、学习重、难点: 学会计算十几减 7 6,并能准确理解算理三、学习过程:(1)自主探究1. 口算118 149 138 159119 179 128 1682. 看卡片,说出( )里应填多少。 6( )12 8( )137( )11 7( )149( )16 6( )133. 1284,说一说想的过程。(2) 合作交流1、 出示 请你说说看到了什么,并描述这一情景。2、 从图中你知道了什么?问题是什么?你怎样解决?23、 尝试着列出算式4、 你能像十几减 8 那样

2、用不同的方法来计算 13-6 和 13-7 吗?把你的方法和小伙伴们交流交流。5、学生讨论后汇报计算方法,教师适时点拨。(三)尝试应用1、算一算,比一比,在里填上“” 或 “=”。11 - 8 4 13 - 8 6-2 15- 7 9+1 14 -9 5 12-7 4+2 5+3 13-716 -7 5+4 12-94-2 5+ 918-62、算一算,找规律。11 12 13 14 15 16 17 18-7我发现( )3、个 元 7 元13 个(四)拓展提高一本书有 16 页, 方方看了 7 几页没看? = (五) 我的反思:参考答案:15元6个3自主探究1、口算3 5 5 62 8 4 82看卡片,说出( )里应填多少。 6 54 77 7我发现:得数只要看十几的个位是几,得数就是比几多 331284, 想加算减法,破十法,连减法等等,体现算法多样化。合作交流:1、有两个小朋友在看鱼,池塘里的金鱼很漂亮等等2、13 条金鱼,黑鱼有 7 条,红鱼有几条?13 条金鱼,红的有 6 条,黑的有几条?3、13-6=713-7=64、与十几减 8 相似,想加算减,还有破十法,连减法等尝试应用:1、 = 2、4 5 6 7 8 9 1 0 113、13-6=7 15-7=8拓展提高:16-7=94

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