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.
truebluemeandyou:DIY Paper Frame Tutorial and Printable from kreativbuehne. These folded paper frames are quite small - but nice for quotes, postcards, kids’ art, and anything else you want to highlight.