As is often the case at this time of year, the winter weather is breaking up my lessons. I introduced stoichiometry, or what I call reaction math, on December 13 but some snow days and semester exams put it on the shelf almost immediately. Now that we are back to school, I needed a way to help students review what they began almost one month ago. I am often inspired by the tweets and blogging of Sarah Carter . I haven't met Sarah, but I know she teaches math and chemistry in Oklahoma. I read her detailed blog posts where she generously shares many great ideas with great interest. Sarah has written about a favorite strategy called Add 'Em Up and her posts were the inspiration for this lesson. In Add 'Em Up, a sheet is created with four math problems. When the answers are added, they should equal a sum that is provided. If the answers do not equal the sum, students know they need to look for, and correct, their errors. With my teaching partner, I created an Add 'Em Up a...
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