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单击此处编辑母版标题样式,编辑母版文本样式,第二级,第三级,第四级,第五级,数 学,人教,一年级（上册）,8,20,以内的进位加法,第,3,课时,5,、,4,、,3,加几,情景导入,9+5= 9+3= 8+5= 8+3= 9+4=,你是怎样快速算出来的？,9+2= 8+4= 7+5= 6+6= 6+8=,7+6= 7+8= 9+6= 9+9= 8+8=,14,12,13,11,13,11,12,12,12,14,13,15,15,18,16,探究新知,5,7,5,8,怎样想能很快说出得数？,4,8,3,9,探究新知,5,2,12,5,7,10,13,5,8,拆大数，凑小数,5,3,10,6,2,12,4,8,10,12,3,9,7,2,10,探究新知,2,3,12,5,7,10,13,5,8,拆小数，凑大数,3,2,10,2,2,12,4,8,10,12,3,9,2,1,10,探究新知,交换加数的位置，和不变,7,5,12,5,7,12,8,5,13,5,8,13,8,4,12,4,8,12,3,9,12,9,3,12,巩固练习,做一做,5,+,6,11,4,+,7,11,巩固练习,做一做,9,+ 5 =,5,+ 9 =,9,+ 4 =,4,+ 9 =,8,+ 3 =,3,+ 8 =,14,14,13,13,11,11,9,+ 2 =,2,+ 9 =,11,11,巩固练习,做一做,5,+,6,=,7,=,8,=,9,=,4,+,7,=,8,=,9,=,11,12,13,14,11,12,13,3,+,8,=,9,=,11,12,巩固练习,13,11,算一算两种体育用品各有多少。,课堂小结,这节课你学会了什么？,谢谢,观看,
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