第五单元:6~10的认识和加减法 10的加减法 北京西城区宣武回民小学 王裔琳
一、复习铺垫,激活经验 2+6= 8 2+4= 6 7+2= 9 3+5= 8 5+2= 7 4+4= 8 4+3= 7 5+1= 6 5+4= 9 0+9= 9
一、复习铺垫,激活经验 7 10 5 5 10 9 1 10 3 6 9 3+6=9 6+3=9 9-3=6 9-6=3 2 8 10 3
二、激发兴趣,探究新知 1 + 9 = 10 1 9 10 9 1 10 10 9 + 1 = 10 9 1 10 10 – 9 = 1 10 9 1 1 9 10 10 – 1 = 9 1 9
二、激发兴趣,探究新知 10 – 2 = 2 + = 10 – = 8 10 2 10 8 8 8 2 10 – 3 = 3 + = 10 – = 7 10 3 10 7 7 7 3
二、激发兴趣,探究新知 4 + 6 = 10 – = 10 6 10 4 6 4 6 4 10 5 + 5 = 10 – 5 = 10 5 5 5
三、算式排序,观察规律 加法 减法 1 + 9 = 10 10 – 1 = 9 2 + 8 = 10 10 – 2 = 8 3 + 7 = 10 4 + 6 = 10 5 + 5 = 10 6 + 4 = 10 7 + 3 = 10 8 + 2 = 10 9 + 1 = 10 减法 10 – 1 = 9 10 – 2 = 8 10 – 3 = 7 10 – 4 = 6 10 – 5 = 5 10 – 6 = 4 10 – 7 = 3 10 – 8 = 2 10 – 9 = 1
三、算式排序,观察规律 1 + 9 = 10 3 + 7 = 10 2 + 8 = 10 9 + 1 = 10 7 + 3 = 10 10 – 1 = 9 10 – 9 = 1 2 + 8 = 10 8 + 2 = 10 10 – 2 = 8 10 – 8 = 2 3 + 7 = 10 7 + 3 = 10 10 – 3 = 7 10 – 7 = 3 4 + 6 = 10 6 + 4 = 10 10 – 4 = 6 10 – 6 = 4 5 + 5 = 10 10 – 5 = 5
四、实践应用,内化提升
四、实践应用,内化提升 2. + = 8 6 7 2 4 3 10 10 10 10 = - 8 9 10 2 1
四、实践应用,内化提升
四、实践应用,内化提升 看图列出算式 6+4=10 4+6=10 10-6=4 10-4=6
四、实践应用,内化提升 看图列出算式 还剩 吃掉 ?个
四、实践应用,内化提升 请题出问题并列式解答