[课例]浙教版教材七册。[案例1]学生手中有边长是1平方厘米的小正方形纸片20个。教师要求学生把这些小正方形铺到一个长5厘米,宽3厘米的长方形上。看看要铺多少个。(学生操作后)师:一共铺了多少个?(生:15个)师:你怎么知道是15个?生:全部数一数,数出来。生:数的方法太麻烦,长方形的长的边放了5个,宽的边放了3个,利用3乘以5等于15的乘法计算方法,直接就可以知道共有15个。 [Case] ​​Zhejiao Edition textbook seven. [Case 1] There are 20 small square sheets of 1 square centimeter in the student’s hand. The teacher asked the students to spread these little squares to a rectangle 5 centimeters long and 3 centimeters wide. Look how many to shop. (After student operation) Teacher: How many have been paved? (Students: 15) Teacher: How do you know that there are 15 students? Health: The number of methods is too cumbersome, rectangular long side put 5, wide side put 3, using 3 multiplied by 5 is equal to 15 multiplication method, you can directly know a total of 15.