10的加减法 (2).ppt

10的加减法,对口令,我说9。,我说1，1和9组成10。,1,9,4,10,7,10,2,10,10,6,3,8,在 中填上合适的数,口算我最棒,9 5 = 8 + 1 = 5 + 3 = 8 4 = 9 8 = 2 + 7 =,6 + 3 = 1 + 7 = 8 3 = 9 6 = 4 + 5 = 8 7 =,4,9,8,4,1,9,9,8,5,3,9,1,+,=,-,=,9,1,1,10,+,=,-,=,1,9,9,1,10,10,10,9,你们是怎样计算的？,二、探究新知,看图你能列出哪些算式？,10,10,9,1,8,二、探究新知,8,8,2,看图你会填一填吗？,你是怎样想的？,10,想一想。,4,二、探究新知,7,10,7,7,3,10,4,4,6,6,5,想10的组成可以帮助我们计算。,10,+,=,-,=,8,2,2,10,+,=,-,=,2,8,8,2,10,10,10,10,8,+,=,-,=,7,3,3,10,+,=,-,=,3,7,7,3,10,10,10,10,7,+,=,-,=,6,4,4,10,+,=,-,=,4,6,6,4,10,10,10,10,6,+,=,-,=,5,5,5,10,10,10,5,送信。,三、知识运用,8,10,4,填一填。,10 ,6 ,8,9,10,三、知识运用,8,4,2,找朋友！哪两个数合起来是10,1,6,5,4,3,2,9,8,7,5,8 4 2,2.,10 - =,7 3 1,10 - =,10,10,6.,5,7,2,9,3,8,6,4,1,看谁算得又对又快,2+8= 5+5= 7+3= 1+9= 6+4= 10-1= 10-8= 10-6= 10-3= 10-5= 10-9= 10-7=,10,10,10,10,10,9,2,4,7,5,1,3,7.,10 个,? 个,? 个,8 个,3,10,7,-,2,8,10,+,10.,5,5,5,5,10,+,0+9=1+8=,