开会啦,情境导入,探究新知,课堂小结,课后作业,课堂练习,加与减(一),1,情境导入,共11人,不够,探究新知,4,答:缺4把椅子。,1,6,解决“缺多少”问题,一一对应法,每人1把 ,还差几把?,还差8把,8,答:还差8把 。,课堂练习,算一算。,12 - 8 = 14 - 9 = 15 - 9 = 15 - 6 = 17 - 8 = 13 - 7 = 11 - 8 = 14 - 6 = 18 - 9 =,4,5,6,9,9,6,3,8,9,里填几?,8 + = 14 14 - 8 = 6 + = 13 13 - 6 = + 9 = 11 11 - 9 = ,6,7,2,6,7,2,加法和减法是逆运算。,套圈游戏。,14-9=5(个),答:有5个没套中。,解决“缺多少”问题的方法:,这节课你们都学会了哪些知识?,1、“一一对应”法。,2、“列式计算”法。,课堂小结,课后作业,1.从教材课后习题中选取; 2.从课时练中选取。,