This page includes a number of resources for the teaching of combinatorial topics. First, I have included some classroom ideas for practicing teachers, particularly at the K-12 level (for now). Second, there are a number of citations for combinatorics textbooks that might be appropriate for an upper-level undergraduate or graduate course. These books provide excellent resources for any mathematics student interested in becoming a better counter! I hope to expand this page to include other kinds of teaching resources as well.

**Classroom ideas connected to articles in practitioner journals**

Here are more problems related to the 2012 *Mathematics Teaching in the Middle School* article “Counting using sets of outcomes,” which can foster the use of systematic listing for middle school students: More problems for middle school students. Please email me at Elise (dot) Lockwood (at) oregonstate (dot) edu for solutions or for more ideas!

In the 2014 *Mathematics Teacher *article entitled, “Both answers make sense! Using the set of outcomes to reconcile differing answers in counting problems,” I talked about a problem that had two seemingly reasonable answers, one of which resulted in an overcount of the set of outcomes. Click here for a more in-depth discussion of the mathematics behind the Committee Problem.