Cathyvv. how awesome that you taught your grandson to use his head vs. the calculator! I'm not a teacher, but I had some good ones, and remember well a lot of our work was repetition. And, oh, I'm an LPN working in a facility with people with disabilities. A former director had a saying - "Retarded means slow - NOT stupid!" I smile many times at work because the people we serve are smarter that many think they are!