Day 19: Their heads hurt

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This lesson is my all time favorite.  It is a common mistake seen with writing equations and even using magic tricks doesn’t ALWAYS help solve it.  It is also a great way to get them to start proving their work and challenging them in SO MANY WAYS!  I had students arguing and discussing math ALL PERIOD!!  Truth be told no one nailed it just quite yet BUT we will close up shop tomorrow.

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