How many cats?

Lewis Carrol 1880 task with a twist. Used this for an EOY department meeting. The task is discussed in the Building Thinking Classrooms book Additional Resources for the curious (also on screen 7). Internet explanation NCTM article on the task Book Study guide: BUILDING THINKING CLASSROOMS IN MATHEMATICS Shared BTC practices site Podcast (by teachers and for teachers!) Sum of it All Jarret Lerner activites

By Norma B Gordon