凑十法步骤教程口诀记住后很简单
乘法凑十法口诀？
乘法凑十法口诀？
1）小九九，乘法口诀的简略版本：45个等式
1x11
1x22 2x24
1x33 2x36 3x39
1x44 2x48 3x412 4x416
1x55 2x510 3x515 4x520 5x525
1x66 2x612 3x618 4x624 5x630 6x636
1x77 2x714 3x721 4x728 5x735 6x742 7x749
1x88 2x816 3x824 4x832 5x840 6x848 7x856 8x864
1x99 2x918 3x927 4x936 5x945 6x954 7x963 8x972 9x981
（2）大九九即乘法口诀完整版本9*981个等式
1x11 2x11 3x13 4x14 5x15 6x16 7x17 8x18 9x19
1x22 2x24 3x26 4x28 5x210 6x212 7x214 8x216 9x218
1x33 2x36 3x39 4x312 5x315 6x318 7x321 8x324 9x327
1x44 2x48 3x412 4x416 5x420 6x424 7x428 8x432 9x436
1x55 2x510 3x515 4x520 5x525 6x530 7x535 8x540 9x545
1x66 2x612 3x618 4x624 5x630 6x636 7x642 8x648 9x654
1x77 2x714 3x721 4x728 5x735 6x742 7x749 8x756 9x763
1x88 2x816 3x824 4x832 5x840 6x848 7x856 8x864 9x872
1x99 2x918 3x927 4x936 5x945 6x954 7x963 8x972 9x981
一位数加两位数的凑十法口诀？
凑十法是二十以内的进位加法的基本思路，运用凑十法能将20以内的进位加法转化为学生熟悉十加几的题目，思路是:一看（看大数），二拆（拆小数），三凑十，四连加（加剩数）比如，9 5，将5拆成4和1，因为9凑十缺1，所以拆分出1。所以9 5，就分解计算9 110，然后10 414，最后9 514