我星期二有两节数学课。

I have two math classes on Tuesday.

在下午我们有两节数学课和一节音乐课。

In the afternoon we have two math lessons and one music lesson.

他们有的时候一天只上两节数学课，剩余的时间都用来自我提高和数学讨论。

And they might teach as few as two maths lessons a day, giving the rest of the day over to personal study and discussion of maths.