LOL OHGrandma, I didn't mean to be disparaging to teachers just that with a cursory glance, the problems would look like the usual add/sub problems but they are quite complex. The bar diagrams makes it look deceptively simple. Before I learned bar diagrams, I had to use algebra to solve them. The teacher might not look that closely at the books.

Last edited by Dazed&Confuzed; 12/08/08 07:07 AM.