两位数乘两位数的笔算是人教版数学教材三年级下册的内容。它是多位数乘法的基础,也是小学计算的一项基本功。乘数从一位数到两位数,正确笔算对部分学生来说有一定的难度。学完这一内容后,学生虽然对计算方法比较清楚,但是正确率却不高,特别是连续进位时总是出错。究其原因,主要有三个。一是乘、加容易互相干扰。在求积的每一步中都需要乘,写得数时如果前一位有进位,还得加上进上来的数,一会乘、一会加,学生容易混淆。二是计算过程中 Two-digit double-digit pen count is the third edition of the textbook of the PEP teaching material. It is the basis of multi-digit multiplication, but also a basic calculation of primary school. The multiplier from one digit to two digits, the correct calculation for some students have a certain degree of difficulty. After learning this content, the students although the calculation method is relatively clear, but the accuracy is not high, especially when the continuous carry is always wrong. The reason, there are three main. First, multiply, add easy to interfere with each other. In each step of the product of the need to multiply, write the number of time if the previous carry, you have to add into the number, a ride, a will increase, students easily confused. Second, the calculation process