LOVED this tweet from Dan Meyer yesterday, so I gave my classes the Day 46 calculator problem from Math Arguments 180 today. It was awesome! Immediate confusion, questioning, and arguing. Some students changed their minds half a dozen times while listening to the reasoning of others, and some even wanted to argue that both calculators were correct. Great discussion! My only regret is that I didn’t “drop the mic, and walk away,” like Dan suggested. Maybe next time.