This was a lesson that I dreamed about writing before I ever started this crazy venture. I wanted students to understand how the three primary properties of numbers could be used to manipulate algebraic expressions enough to solve riddles. So, I build a variety of exercises that force students to manipulate an expression to find its value based on the value of a related expression. I love this lesson and really want to encourage teachers to let me know how it went.
On a funny side note, this was one of the first videos I had ever made. So, I had a terrible background, no theme music, and couldn’t see very well because I wasn’t wearing my glasses.