100 Problems Involving the Number 100

2020 marks the 100th anniversary of the National Council of Teachers of Mathematics (NCTM). Due to the impacts of COVID-19, NCTM decided to cancel its Centennial Annual Meeting and Exposition, which was to be held April 1–4 in Chicago. Instead, NCTM is celebrating the centennial year and supporting the math community by presenting virtual learning activities. Dubbed 100 Days of Professional Learning, these 100 free webinars are being held on select days from April through October.

I was honored when Mike Shaughnessy, a past president of NCTM and a former employee of MLC, asked if I’d present my session in Chicago. When that couldn’t happen, I was happy to have the opportunity to deliver “100 Problems Involving the Number 100” as one of the virtual webinars.

It’s impossible to cover 100 problems in 60 minutes, but we had fun with five of them. One of my favorites, Dog Days, looked like this:

If you missed the webinar on May 14, you can hear the discussion about this problem and four others, as well as get a PDF of all 100 problems, via the links below.