小学数学第六册第一单元备课札记沈长生“乘数是两位数的乘法”的编排，与通用教材相比有了较大的改进，它不再与乘数是三位数的乘法同编在一个单元之中，而是单独成为一个单元。这样编排，一是由干乘数是两位数的乘法是学习多位数乘法的基础，需集中力量讲清算理，归纳法... Primary Mathematics sixth book first unit preparation notes Shen Changsheng “multiplier is a two-digit multiplication,” the arrangement, compared with the general textbook has been greatly improved, it is no longer with the multiplier is a three-digit multiplication Compiled in a unit, but to become a single unit. This arrangement, first, by the dry multiplier is a two-digit multiplication is to learn the basis of multi-digit multiplication, you need to focus on clear calculation, induction ...