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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,*,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,20,以内的退位减法,整理和复习,20以内的退位减法整理和复习,17,6,1,3,7,14,8,1,5,3,11,9,16,6,计算接力赛,2,11,6,12,6,10,176137 148 1531191,17,6,11,1,3,7,6,1,4,8,6,1,5,3,12,1,1,9,2,16,6,10,计算接力赛,退位,不退位,176111376 1486 15312,20,以内的退位减法,十几,减,9,十几减,8,、,7,、,6,十几减,5,、,4,、,3,、,2,回顾梳理本单元内容,计算,解决问题,20以内的退位减法 十几 十几减,晶晶,整理复习,沟通联系,合作要求:,2,人为一组,先说一说晶晶是怎样整理的,再把余下的算式填出来,然后用你喜欢的方法快速算出每道算式的结果,写在算式的后面,最后看看算式的排列有什么规律。,晶晶整理复习,沟通联系合作要求:,观察退位减法表,12,9,3,14,9,5,16,9,7,15,9,6,17,9,8,18,9,9,13,9,4,11,9,2,12,8,4,12,75,12,66,12,57,12,48,12,39,13,8,5,13,76,13,67,13,58,13,49,14,8,6,14,77,14,68,14,59,15,87,15,78,15,69,16,88,16,79,17,89,1183,1165,1174,1156,1147,1138,1129,观察退位减法表129314951697159,12,9,3,14,9,5,16,9,7,15,9,6,17,9,8,18,9,9,12,8,4,12,75,12,66,12,57,12,48,12,39,13,8,5,13,76,13,67,13,58,13,49,14,8,6,14,77,14,68,14,59,15,87,15,78,15,69,16,88,16,79,17,89,13,9,4,11,9,2,1183,1165,1174,1156,1147,1138,1129,11,11,11,11,11,11,11,11,1,1,1,1,1,1,1,1,1,1,1,1,1,1,观察退位减法表:,横,看,12931495169715961798,12,9,3,14,9,5,16,9,7,15,9,6,17,9,8,18,9,9,13,9,4,11,9,2,12,8,4,12,75,12,66,12,57,12,48,12,39,13,8,5,13,76,13,67,13,58,13,49,14,8,6,14,77,14,68,14,59,15,87,15,78,15,69,16,88,16,79,17,89,1183,1165,1174,1156,1147,1138,1129,12,8,4,12,75,12,66,12,57,12,48,12,39,13,8,5,13,76,13,67,13,58,13,49,14,8,6,14,77,14,68,14,59,15,87,15,78,15,69,16,88,16,79,17,89,1183,1165,1174,1156,1147,1138,1129,1,1,1,1,1,1,1,1,1,1,1,1,1,1,观察退位减法表:,竖,看,12931495169715961798,观察退位减法表,12,9,3,14,9,5,16,9,7,15,9,6,17,9,8,18,9,9,13,9,4,11,9,2,12,8,4,12,75,12,66,12,57,12,48,12,39,13,8,5,13,76,13,67,13,58,13,49,14,8,6,14,77,14,68,14,59,15,87,15,78,15,69,16,88,16,79,17,89,1183,1165,1174,1156,1147,1138,1129,观察退位减法表129314951697159,同学们,你们能把差是,6,的算式一组一组地说出来吗?,11-5=6,12-6=6,13-7=6,14-8=6,15-9=6,10-4=6,9-3=6,8-2=6,7-1=6,让我来考考你吧。,同学们,你们能把差是 6 的算式一组一组地说出来吗?11-5,解决问题,12,9,3,(朵),12,9,小林比小丽少得了几朵?,小丽和小林的红花相差几朵?,口答:小丽比小林多得了,3,朵。,解决问题1293(朵)129小林比小丽少得了几朵?小丽和,数学乐园,数学乐园,第一关:夺红旗,3,6,6,6,5,5,5,5,第一关:夺红旗36665555,12-3=9,第二关:摘苹果,12-3=9第二关:摘苹果,13-8=5,第二关:摘苹果,13-8=5第二关:摘苹果,13-6=7,第二关:摘苹果,13-6=7第二关:摘苹果,11-8=3,第二关:摘苹果,11-8=3第二关:摘苹果,15-7=8,第二关:摘苹果,15-7=8第二关:摘苹果,15-8=,5,10,2,3,正确做法:,第三关:下面计算有错误吗?,15-8=,5,10,2,14-5=,4,10,5,9,14-5=11,7,15-8=510 23正确做法:第三关:下面计算有错,14,8 6,只,第四关:生活中的数学,14 8 6 只第四关:生活中的数学,第五关:在()里该填什么数?,9-4=11-,(),14-5=2+,(),5,6,9,7,第五关:在()里该填什么数?9-4=11-(,课堂检测,课堂检测,13,6,8,7,13,5,16,8,15,6,7,9,15,7,14,5,6,6,12,5,14,6,12,9,7,8,8,7,15,9,9,8,8,16,12,3,17,8,3,9,4,6,11,6,7,5,4,7,5,9,8,8,7,9,9,6,16,9,7,13,12,5,14,6,6,15,一、我是计算小能手,136 87,教室里有,16,个小朋友在做数学作业,其中男生有,8,人。还有,7,个小朋友在画画,做数学作业的比画画的多几人?,16-7=9,(人),口答:做数学作业的比画画的多,9,人。,二、解决问题我能行,教室里有16个小朋友在做数学作业,其中男生有8人。还有7个小,本单元结束了,你想说些什么?,本单元结束了,你想说些什么?,作业:,第,25,页练习六,第,4,题;,第,26,页练习,六,,第,6,题。,作业:第25页练习六,第4题;,
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