Everyday Math Self Check Math Boxes

Last year was the first year I had my students self check their EM Math Boxes.  {If you're not familiar with Everyday Math, each lesson has 5 - 6 boxes that practice skills from all different topics.  For example, there will be one problem each of geometry, basic facts, number stories, data,  and measurement on one page.}

Here has been my evolution of thinking:

6 years ago I would take home 76 Math Journals a couple weekends a month and give most of the weekend to check math boxes---INSANE!

The next couple years I just check the boxes linked to assessment, but I didn't like the lazy work habits I saw in some students.

I thought long and hard.  I thought about what I really wanted my students to accomplish.  I wanted them to get maximum practice and feedback for the practice.  

Last year I started having students check their own math boxes.  I create and display a key.  All the keys for the current unit go into a clear pocket.  Students use red pen to make all corrections.

Of course there are a few cheaters, but most students thrive in the low pressure approach to practice.

I do check occasionally for effort, but I'm able to invest more energy in the lessons and what extra support kids need.

What's working for you about the way you teach math?