Perhaps this isn’t the best “Act 1” I’ve given – it might be a little “too helpful” as Dan Meyer would say. I could strip it down more by taking off the prices & only revealing them in Act 2. Thoughts as to whether or not that would make this a better activity are welcome – comment below.
All the groups found it pretty easy to solve. Then I showed them how to write the two equations using c for coffee & m for muffins. I showed them how to solve algebraically using elimination. I really tried to get them to see how the steps they followed were the same as those in the algebraic solution:
They had the rest of the class to start on the homework: some basic elimination exercises on Khan Academy.
Folder w/ all lesson materials here.
– Laura Wheeler (Teacher @ Ridgemont High School, OCDSB; Ottawa, ON)