《蚂蚁做操》是北师大版小学数学三年级上册第六单元第一课时内容。本节课是在学生认识了整数,能够用竖式计算加减法以及能够口算两位数乘一位数的基础上进行教学的。本课是学生第一次学习乘法的竖式计算,与加减法竖式不同的是:不是相同数位上的数相乘,而是用一位数分别去乘另一个乘数的每一位,再把所得的积相加。本课例需要解决的主要问题是如何帮助学生在理解算理的基础上掌握算 “Ants do gymnastics” is the first lesson of the sixth unit of Beijing Normal University version of elementary school mathematics grade three volumes. This lesson is taught when students are familiar with integers, can use vertical addition and subtraction, and can double-digit by one digit. This is the first time students learn to multiply the vertical calculation, and the addition and subtraction method is different from the vertical: not the same number of digits multiplication, but with one digit to multiply each by the other , Then add the resulting product. The main problem to be solved in this lesson is how to help students grasp the basis of understanding arithmetic