Every once in a while, an idea pops into my head out of necessity for something better. Years and years ago, I was actually teaching 3rd grade at the time, I became fed up with the lack of repetition in my math program. There just wasn't enough review built in for the kids to grasp anything. I would teach a concept once and move on. Done and done. The problem was, the kids just didn't get it. After scouring the internet, reading tons of books, and using my own bag of tricks, Calendar was…
