DIY String Art Projects - Heart String Art - Cool, Fun and Easy Letters, Patterns and Wall Art Tutorials for String Art - How to Make Names, Words, Hearts and State Art for Room Decor and DIY Gifts - (Diy Art For Teens)
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.