Which one of these does not belong mathematically?

Explain.

Visual mathematics will fire up your students, especially those that do not have an “answer”.  They also work as math warm ups and math shares at the end of your lesson. It’s SO easy to throw up 3 or 4 objects under your smartboard and voila! You’ve got instant math talk and math debate.  The only rule…there must be mathematical words when you describe and defend your thinking.

Your students will blow your mind!