3的组成与加减法——学前班用PPT参考幻灯片.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,*,3,的组成与加减法,1,把圆分成两堆，怎么分？,把圆分成两堆，怎么分？,2,3,1,2,3,3,2,1,4,把苹果分成两堆。,5,3,2,1,6,3,1,2,7,8,+,=,2 +1 =3,=,+,1 +2 =3,9,=,-,=,3 -2 =1,-,3 -1 =2,10,3 -1 =,3 -2 =,2,1,11,3 -1 =,2 +1 =,2,3,12,3,2,1,3,3,填,13,盘里有3个苹果，小明拿了1个，还剩,几个苹果？,想一想,14,3,3,-,=,0,15,16,17,再,见,18,