要提高课堂教学效率。必须抓好这样几个环节。一、课前五分钟要“三练”1.基础知识堂堂练。在授课前要练习一些与本课密切相关的基础知识。如在讲除数是两、三数除法时,需要在课前练习的内容以表内除法,一位数乘两位数的乘法为主。其中有表内除法和小九九口诀:一位数乘两位数的乘法; To improve the efficiency of classroom teaching. Must do a good job in such a few links. First, five minutes before class to “three practice” 1. Basic knowledge Danyang practice. Practice some basics closely related to this lesson before you teach. As in the divisor is two or three division, you need to practice the contents of the table division, one-digit multiplied by two-digit based. Among them there are divisions within the table and small ninety-nine formulas: multiplication of one digit by two digits;