This is an awesome trick for multiplication facts with Once you see how it's done, it's amazing. There is one where you make your fingers touch, but this is easier to see. I almost wish we taught multiplication!
Great trick for teaching how to make Students use a highlighter to find the and then circle the other number with a crayon. Although, I think it would be easier to always make 10 with the larger number, not necessarily the first number in the equation.