Do You Have a Reference Mass?

Teachers should not constantly talk over students when they're doing work. Make youre students know whether they're right or wrong, and don't wait until it's too late. When i in my first job in teaching, i used to put the answers up for an excise at the beginning of a lesson. But then i moved to another school where immediately i found that the students would an just copy own the answers from the board. So i had to think more cleverly about how to make sure that students were able to know immediately whether they had the understanding to carry on with the exercise.