一年级数学上册第二单元分与合教案沪教版五四制.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,分与合,1,、这撞大楼一共有几层楼？,一共有,11,层楼。,2,、每一层楼一共有几个房间？,一共有,10,个房间。,3,、猜猜小胖家住的是哪一间？,小胖家住在最高一层的最旁边一间，现在正开着灯在家呢！你们知道小胖家住在第几层的哪一间吗？,小胖家住在第,11,层楼，从右往左的第,1,间。,探究一,请你根据每一层楼的亮灯、暗灯情况把它记录下来。,探究一,探究二,10,4 6,7 3,5 5,9 1,2 8,6 4,1 9,0 10,8 2,10 0,3 7,那么多的分与合怎么记住它呢？,你发现了什么？,探究二,探究二,10,0,10,1,9,2,8,3,7,4,6,5,10,0,9,1,8,2,7,3,6,4,5,10,10,9,8,7,6,5,4,3,2,1,0,0,1,2,3,4,5,6,7,8,9,10,10,0,1,2,3,4,5,6,7,8,9,10,10,9,8,7,6,5,4,3,2,1,0,探究一,探究二,探究二,小结：,10,以内的分拆可以从小到大记，从大到小记，还可以一对一对记。,探究一,探究二,探究二,练习一,3,4,6,填数楼,练习一,练习二,练习三,练习一,3,3,2,1,0,0,1,2,3,3,3,2,1,0,0,1,2,3,3,3,0,2,1,0,3,1,2,练习一,练习二,练习三,练习一,4,0,1,2,3,4,4,3,2,1,0,4,0,1,2,3,4,4,3,2,1,0,4,0,4,1,3,2,4,0,3,1,2,练习一,练习二,练习三,6,0,1,2,3,4,5,6,6,5,4,3,2,1,0,练习一,6,0,1,2,3,4,5,6,6,5,4,3,2,1,0,6,0,6,1,5,4,2,3,6,0,5,1,2,4,3,练习一,练习二,练习三,