人教版一年级数学下册十几减九课件.ppt

,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,十几减,9,20以内退位减法,开火车口算复习,:,9,3=,9,7=,9,5=,9,8=,9,9=,9,6=,9,4=,9,2=,15,10=,16,10=,12,2=,12,10=,18,10=,17,10=,12,14,16,11,17,15,18,13,5,8,7,6,10,2,有,15,个气球，,卖了,9,个。,还有几个,?,有几个没套中,?,我投了,14,个圈，,套中,9,个。,15-9=14-9=,1,、,自己动手,用学具摆一摆,2,、,和同桌说一说怎样算？,12,9=,3,想：,9,加（,3,）等于,12,。,12,9=,3,10,2,1,3,10,9=1,2,1=3,你喜欢哪一种方法？,11,9,13,9,17,9,14,9,15,9,18,9,16,9,12,9,4,2,7,9,6,8,5,3,11,9,12,9,13,9,14,9,15,9,16,9,17,9,18,9,=,2,=,4,=,6,=,8,=,3,=,5,=,7,=,9,跳木桩,这节课你们有什么收获？,请说说吧？,