乘法的初步认识14

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,*,*,5,的乘法口诀,第,2,课时,课件,设计：李明刚,指导教师：胡开,勇马,国策,5,7=,5,5=,5,6=,5,8=,5,9=,35,五七三十五,25,五五二十五,30,40,45,五六三十,五八四十,五九四十五,计算：,25=,55=,57=,59=,85=,65=,看算式说口诀。,说一说。,10,15,20,25,30,35,40,45,都是,0,。,算一算，议一议。,5,观察积的个位，你有什么发现？,5,7,5,7,35,35,5,9,45,9,5,45,5,8,40,8,5,40,1.,读一句口诀，写两个乘法算式。,”,“,”,或,“,=,”,。,20,30,5,21,25,30,15,35,45,15,18,40,10,5,45,35,16,9,3.,谁先回家？,5,3+5=,5,4=,4,5=,5,6+5=,5,7=,7,5=,5,9-5=,5,8=,8,5=,20,20,20,35,35,35,40,40,40,4.,计算。,观察每组算式，,你有什么发现？,+,5.,在,里填上,“,+,”,“,-,”,或,“,”,。,2,4,8,5,6,30,6.,取药。,