笔算减法（隔位退位）,7,204108（）,二年级同学画了204幅儿童画。,一年级同学比二年级同学少画108幅。,一年级同学画了多少幅儿童画？,7,204108（）,204,108,6,9,百十个,先在计数器上拨一拨，再算一算。,个位不够减，要从十位退1。十位上是0，怎么办？,96,幅,答：一年级同学画了幅儿童画。,96,1.,506,283,3,2,2,704,394,0,1,3,502,283,9,1,2,700,394,6,0,3,你会算一算、比一比吗？,2.先找出错在哪里，再改正过来。,602,178,4,2,5,800,175,5,2,7,405,319,6,9,5,4,9,8,7,6,3.用竖式计算，并验算。,603245,40789,302218,20095,=358,=318,=84,=105,302,218,4,8,200,95,5,0,407,89,8,1,3,603,245,8,5,3,84,+218,2,0,3,105,+95,0,0,2,318,+89,7,0,4,358,+24
