Love this concept. I still use it to this day when I get a bit confused. Also, the numbers are inverse of themselves. 2x9= 18 9x9=81 Once you get to 45 and 54, you go backwards in reverse from there. I know, confusing, but it can help.
Teaching your students multiplication this fall? Use a foldable to help them learn and master different strategies. They can take it home, glue it in a math journals, make it at a center, etc. Lots of uses.