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.
DIY Earrings DIY Leaves of Beads Earrings As soon as I figure out the diagram i'll try it - don't really understand the need for the large loop on the bottom? Does it tuck behind at the end to give a clean finish on the bottom?