小学数学人教一年级整理和复习-杨莎.ppt

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,天津工业大学附属小学,杨莎,17,6,1,3,7,14,8,1,5,3,11,9,16,6,计算接力赛,2,11,6,12,6,10,17,6,11,1,3,7,6,1,4,8,6,1,5,3,12,1,1,9,2,16,6,10,计算接力赛,退位,不退位,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,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。,观察退位减法表,12,9,3,14,9,5,16,9,7,15,9,6,17,9,8,18,9,9,13,9,4,11,9,2,12,8,4,12,75,12,66,12,57,12,48,12,39,13,8,5,13,76,13,67,13,58,13,49,14,8,6,14,77,14,68,14,59,15,87,15,78,15,69,16,88,16,79,17,89,1183,1165,1174,1156,1147,1138,1129,12,9,3,14,9,5,16,9,7,15,9,6,17,9,8,18,9,9,12,8,4,12,75,12,66,12,57,12,48,12,39,13,8,5,13,76,13,67,13,58,13,49,14,8,6,14,77,14,68,14,59,15,87,15,78,15,69,16,88,16,79,17,89,13,9,4,11,9,2,1183,1165,1174,1156,1147,1138,1129,11,11,11,11,11,11,11,11,1,1,1,1,1,1,1,1,1,1,1,1,1,1,观察退位减法表：,横,看,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,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,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。,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。,数学乐园,第一关：夺红旗,3,6,6,6,5,5,5,5,12-3=9,第二关：摘苹果,13-8=5,第二关：摘苹果,13-6=7,第二关：摘苹果,11-8=3,第二关：摘苹果,15-7=8,第二关：摘苹果,15-8=,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=11,7,14,8 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,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,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,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。,