In this episode, Jenn and I interview Peter Liljedahl, the author of Building Thinking Classrooms in Mathematics: 14 Teaching Practices for Enhancing Learning. As former math teachers, Jenn and I had a great time talking with Peter about concrete and actionable ways teachers can improve math instruction. The practices are simple, high impact, and are easy and cheap to implement. Given what we know now, not implementing these 14 practices borders on educational malpractice. As always, send your comments, questions, and show ideas to mike@schoolleadershipshow.com.  Consider rating the podcast in iTunes and leaving a comment.  And please pass the show along to your colleagues.  Additionally, if you have other NON-education books with implications for school leaders, send those suggestions our way, too. And finally, If you or someone you know would like to sponsor the show, send Mike an email at mike@schoolleadershipshow.com.