I remember when grade three, we changed to a math teacher. He is not tall, not fat or thin with a pair of nearsighted glasses. He said, "my surname is Cai, and I will give you math lessons later."

　　'bell, bell, Bell' ring, Tsai, come, and he says, '' '' '' '' '' 'I'll review' 'I' '' '' because every math teacher in the past will have a math problem. Unexpectedly, Cai did not keep maths problems, but also led us to play games. Answer the math problem and add one point. Answer the wrong math problem and do 10 math problems.

　　In order not to be punished, everyone studied mathematics very hard. As a result, we finally got the first average score in the whole school year.

　　I like math class. This kind of learning method, our Cai teacher, is not at all "food". ''