一年级数学下册知识点梳理
新人教版·一年级数学下册知识要点汇总第一单元认识图形(二)1.认识和会画长方形正方形三角形圆平行四边形2.七巧板是由1个正方形、1个平行四边形和5个三角形组成的。3.缺了几块砖的方法(1)根据砖的排列规律用画一画来解决。(2)不动手、不动笔,看着第一层就知道第三、五层缺了几块砖,看着第二层就知道第四、六层缺了几块砖。(3)先数一层有几块砖,每一层都是一样长的,算出每层缺了几块砖。第二单元20以内的退位减法1.计算方法11-9=□方法一:破十法方法二:想加法算减法方法三:连减法11-9=211-9=211-9=2先算:10-9=1因为:9+2=11先算:11-1=10再算:1+1=2所以:11-...
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