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单击此处编辑母版标题样式,2019/10/28,#,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,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,#,十几减,8,、,7,、,6,破十法儿歌,退位减，我会算,十几减,9,，是几加,1,，,十几减,8,，是几加,2,，,十几减,7,，是几加,3,，,十几减,6,，是几加,4,，,十几减,5,，是几加,5,。,11,9 =,12,9 =,13,9 =,14,9 =,15,9 =,16,9 =,17,9 =,18,9 =,你发现了什么？,2,3,4,5,6,7,8,9,1,1,9,=,2,1,2,9 =,3,1,3,9 =,4,1,4,9 =,5,1,5,9 =,6,1,6,9 =,7,1,7,9 =,8,1,8,9 =,9,十几减,9,，是几加,1,11,8 =,12,8 =,13,8 =,14,8 =,15,8 =,16,8 =,17,8 =,你发现了什么？,3,4,5,6,7,8,9,1,1,8,=,3,1,2,8 =,4,1,3,8 =,5,1,4,8 =,6,1,5,8 =,7,1,6,8 =,8,十几减,8,，是几加,2,11,7 =,12,7 =,13,7 =,14,7 =,15,7 =,16,7 =,你发现了什么？,4,5,6,7,8,9,1,1,7,=,4,1,2,7 =,5,1,3,7 =,6,1,4,7 =,7,1,5,7 =,8,1,6,7 =,9,十几减,7,，是几加,3,11,6 =,12,6 =,13,6 =,14,6 =,15,6 =,你发现了什么？,5,6,7,8,9,1,1,6,=,5,1,2,6 =,6,1,3,6 =,7,1,4,6 =,8,1,5,6 =,9,十几减,6,，是几加,4,11,8 =,13,7 =,13,6 =,18,9 =,15,8 =,17,9 =,11,7 =,14,6 =,3,6,7,9,7,8,4,8,15,9 =,12,7 =,13,9 =,15,7 =,11,6 =,16,9 =,17,8 =,14,8 =,6,5,4,8,5,7,9,6,15 9 = 6,16 8 = 8,14 7 = 7,14 6 = 8,18 6 = 12,17 4 = 13,16 4 = 12,15 1 = 14,个位能够减,不用退位减,个位不够减,要用退位减,9,5,8,2,6,15 6 13 8 14 7,17 9 11 9 12 6,7,送信,连线,
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