Can differentiate with double digits (double digit by double digit multiplication or even fractions). This site has great math projects. This can be done with nails in a board and colored yarn. Makes a great pricture too.
Earthy Starburst Twig Wreath - doing this! Do it smaller for really cool ornaments, repeat and hang on the fence in winter lit with little lights, do it bigger and attach it to a pole for a great yard ornament. next year x-mas decor