分、小数四则混合运算的教学,是在学生已经掌握了各种运算法则、性质、定律,以及分、小数互化的方法和四则混合运算的顺序的基础上进行的。教学时,我首先安排学生自学、试算课本第九册42页例4。并提出自学课题:①不懂的地方是什么?②会不会计算?你是怎样计算的?通过看书自学、试算,学生一般都能弄清此题的运算法则、顺序,分、小数互化等问题。但是我发现学生虽然看 The teaching of mixed arithmetic of four minutes and four decimal places is based on the fact that students have mastered the various algorithms, properties, laws, and the methods of interdecadal and decimal algebra, and the order of the four mixed operations. Teaching, I first arrange for students to learn, trial textbook ninth 42 cases 4. And put forward self-taught topics: ① what do not know? ② will not calculate? How do you calculate? By reading self-study, trial calculation, students generally can understand the problem of the algorithm, order, And other issues. But I found that although students look