I expect students to come to class prepared. When the tardy bell rings I expect students to be in their seats and getting materials out.
The first thing that we do as a class is to correct homework from the night before. While students do this, I circulate the room and record which students completed their assignments with appropriate work.
After students have corrected their papers, we go over the problems that they struggled with.
After that we have activities associated with the new material.
The majority of each class period is spent with groups working through tasks that teach the concept of the day. While groups are working on these tasks I am circulating the room directing learning, asking questions, and guiding students learning.
This type of learning is often referred to as inquiry-based, activity-based, or standards-based learning. The main idea is this: if students are engaged, questioning each other, and trying to figure out a concept on their own (with teacher assistance when needed), students will remember how to do it better and longer. With this said, it is important for me to point out that each day, before students leave, either myself, a student, or a group of students demonstrate for the class one or multiple ways to solve the problem(s).
Students are also given a small number of homework problems, usually 5 or less - due the next class period.