Clothespin Math on a clothes hanger! LOVE this. Easy to make, and self explanatory. I'm thinking a wire clothes hanger would work better, so the clothes pins are easy to slide back and forth (almost like an abacus).
Teach Your Child to Read - Making a 10 to Add is a great math strategy to help students mentally add bigger numbers. Its a skill I picked up somewhere along the way i.Pave the Way for a Bright, Successful Future.