在教学乘数是两、三位数的乘法后,学生在做课堂练习或测验时,常因时间不够而来不及对答案进行验算,导致计算结果错误。因为传统的验算方法是把题目重做一遍或逆做一遍,针对这一情况,我采用加法来验算乘法的方法,学生对此很感兴趣,同时也减少了验算所需的时间,收到了事半功倍的效果。 In the teaching multiplier is two or three digit multiplication, the students in the classroom practice or test, often because of lack of time and time to answer the check, resulting in calculation error. Because the traditional method of checking is to redo or reverse the subject again, in this case, I use addition to calculate the method of multiplication, students are very interested, but also reduce the time required for checking, and receive more with less. Effect.