2022年100以内加减法口算技巧及6套练习 .pdf

学习必备欢迎下载100 以内加减法口算技巧及6 套练习一、进位加法的简单计算方法不管多大的数相加其最基本的原则都是20 以内的加法原则，20 以内进位加法的速算口诀为：几加九进十减一、几加八进十减二、几加七进十减三、几加六进十减四。由于加法具有交换律，所以我们只需要记住这几句就可以了，在100 以内的加法中，先观察两个各位数字，找出他们中间较大的数，按口诀进行计算可以很快的算出答案。例 1：26+39=我们观察发现两个各位数字分别是6 和 9，6+9大于 10，需要进位，较大的是9，所以应用“几加九进十减一”得到答案的十位就是2+3+1=6，个位就是给 6 减 1等于 5，所以答案就是 65.例 2:38+54=我们观察发现两个各位数字分别是8 和 4，8+4大于 10，需要进位，较大的是8，所以应用“几加八进十减二”得到答案的十位就是3+5+1=9，个位就是给 4 减 2等于 2，所以答案就是 92.下来我们进行几个对应的练习，看谁算的又对又快：9+5=3+8=26+55=34+49=67+25=58+19=39+25=26+38=19+41=28+47=43+39=36+56=二、退位减法的简答计算方法100 以内数的退位减法也是以20 以内数的退位减法为基础的，退位减法的速算口诀为：几减九退十加一、几减八退十加二、几减七退十加三、几减六退十加四、几减五退十加五、几减四退十加六、几减三退十加七、几减二退十加八、几减一退十加九。由于减法中减数和被减数不能交换位置，所以在减法中，先观察两个个位数，当减数比被减数的个位大时，根据减数的各位选择口诀进行计算，即可以很快的算出答案。例 3：5429=我们通过观察发现被减数的个位是4，减数的个位是 9，49，需要退位，所以应用“几减九退十加一”得到答案的十位就是521=2，个位就是给 4+1=5，所以得到答案为25.例 4：6316=我们通过观察发现被减数的个位是3，减数的个位是 6，36，需要退位，所以应用“几减六退十加四”得到答案的十位就是611=4，个位就是给 3+4=7，所以得到答案为47.下来我们进行几个对应的练习，看谁算的又对又快：149=156=2318=4319=5435=3122=4528=8839=7236=6638=(50 题)练习一：时间：学习必备欢迎下载(50 题)练习二：时间：(50 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