Greetings Primarily Math teachers!
Last week NCTM announced a contest that made me smile and think of all of my Primarily Math friends. Do you remember the "Plus sign patterns" problem from the end-of-course problem set? Did you ever think of sharing it (or other 100-chart patterns) with your students?
Whether you remember the problem, you'll enjoy reading about this very simple NCTM contest in the "Sum-Thing" article below. If you're interested in doing this, we will be happy to help out in any way that we can. We would LOVE to see one of your smiling faces on the NCTM Facebook page!