What do we do when they don't get it?

In an earlier post, I asked the question, "What do we do when they don't get it?"  As we have progressed further into our school year, we are figuring out ways to answer that question.  The first is the use of the exit slips.  We are getting quick feedback on our students' level of understanding. After we get this important information, we are intervening immediately the next day.  We are using intervention time or time during the next math period.  We are no longer waiting until the test to find out that our kids need extra help.  The exit slip is so much more reliable than homework to assess a student's level of understanding.