20以内的加减法怎么写( 二 ) _加减法

“破十法”进行减法计算时要注意：先把被减数拆10和小数，然后10减减数差加小数便是差。
5.20以内加减法怎么学习首先，用口决，背熟，然后，知道各个数的大小，比如，可以告诉她， 0代表没有：1就是一，没有一只鲸鱼那么大和一串鱿鱼那么小的区别. 还有，你妹妹如果在不太爱学习的时候，不要认为那样那样才好，要"勉强"她学，不能由着她的性子来. 一天要把20以内的分解复习5遍，多了更好，不过不要太过了，毕竟是小孩喔你妹妹不爱学习，没有兴趣，那么就让她背，熟悉数字数字什么的掰手指，比如说，大拇指代表10啊：左手+ ，右手- ，什么的在3年级就会学习乘法和除法了，要加油哦在背的时候就是多读，多读，就OK了以上我的提议。
6.二十以内的加减法80道口算20以内加减法练习（一） 18- 5 = 17-11 = 13+ 6 = 17- 5 = 16-10 = 5 - 4 = 9 - 4 = 16- 1 = 7 +10 = 9 - 0 = 18+ 1 = 6 +10 = 4 - 0 = 18-12 = 17-17 = 10+ 2 = 10-10 = 9 - 0 = 15- 0 = 4 + 1 = 0 +16 = 2 + 2 = 13-12 = 4 +12 = 13+ 4 = 6 - 5 = 15-13 = 14+ 1 = 3 +12 = 0 + 0 = 0 +17 = 7 - 2 = 2 +14 = 11-10 = 11+ 4 = 10+ 4 = 14- 3 = 11- 1 = 3 - 1 = 13- 2 = 12- 0 = 11+ 0 = 13-10 = 15+ 4 = 3 + 5 = 10+ 7 = 0 + 1 = 19-14 = 11+ 1 = 17- 1 = 16+ 2 = 16- 4 = 3 + 4 = 1 +14 = 14+ 2 = 4 +12 = 12+ 5 = 14+ 1 = 10+ 8 = 17-15 = 15- 3 = 9 - 8 = 11+ 5 = 16+ 1 = 12+ 3 = 17-12 = 1 +17 = 11+ 5 = 2 + 6 = 19- 5 = 7 - 3 = 12+ 4 = 10+ 7 = 1 +12 = 11+ 1 = 17-10 = 9 - 9 = 4 +12 = 11+ 2 = 13+ 2 = 20以内加减法练习（二）姓名：时间：成绩： 16- 1 = 19-13 = 4 - 3 = 1 +14 = 15- 3 = 6 - 5 = 13+ 1 = 11+ 1 = 19- 1 = 2 + 6 = 19-18 = 2 +11 = 2 + 6 = 18-13 = 12+ 7 = 3 + 1 = 3 + 4 = 16-14 = 18- 2 = 5 + 4 = 2 - 2 = 7 - 3 = 6 - 0 = 7 +11 = 13- 3 = 8 - 6 = 0 +18 = 10+ 3 = 18-11 = 17+ 0 = 2 - 2 = 1 + 7 = 6 - 3 = 13+ 1 = 5 +14 = 11+ 0 = 7 - 1 = 0 +10 = 6 - 1 = 2 + 6 = 11-10 = 11+ 3 = 5 +10 = 12-10 = 0 +11 = 5 +10 = 5 - 5 = 19-11 = 17-13 = 2 + 2 = 3 +11 = 10+ 3 = 17- 3 = 1 - 0 = 9 - 5 = 19- 8 = 8 + 0 = 17- 1 = 13-10 = 17+ 0 = 5 - 3 = 9 - 8 = 7 - 3 = 2 - 2 = 14- 2 = 5 - 3 = 0 + 4 = 9 - 8 = 17-14 = 16-14 = 3 +12 = 3 - 0 = 19-15 = 18- 2 = 11+ 2 = 14-12 = 1 + 3 = 5 +11 = 10+ 5 = 11- 1 = 20以内加减法练习（三）姓名：时间：成绩： 5 - 2 = 7 - 6 = 12+ 6 = 10+ 9 = 14+ 5 = 1 + 3 = 2 +10 = 8 +10 = 10+ 8 = 2 - 1 = 9 - 1 = 9 - 5 = 1 + 8 = 12+ 6 = 9 - 3 = 8 - 2 = 17-11 = 11-10 = 7 - 6 = 19- 3 = 15-11 = 7 - 4 = 16-14 = 5 - 2 = 8 - 6 = 15- 2 = 16-13 = 3 +11 = 8 - 7 = 2 +17 = 5 +14 = 14+ 4 = 11+ 3 = 5 +12 = 16-12 = 7 + 2 = 17- 4 = 7 +11 = 18- 7 = 4 + 5 = 19- 5 = 10+ 1 = 2 +15 = 19- 5 = 12-11 = 3 + 3 = 18- 4 = 19-10 = 16-16 = 1 + 8 = 1 +13 = 14- 4 = 18-11 = 18- 7 = 0 +19 = 12+ 1 = 15-11 = 12+ 3 = 18-13 = 6 - 0 = 1 + 7 = 18-16 = 18- 6 = 9 - 1 = 6 - 3 = 13- 1 = 19-15 = 8 - 0 = 6 - 6 = 0 +19 = 9 - 2 = 3 - 3 = 12+ 3 = 2 +11 = 7 - 3 = 13- 2 = 8 - 0 = 1 + 5 = 15+ 3 = 18-15 = 。