I have done many different Piet Mondrian inspired art activities. But this one is now my absolute favorite and so easy to do! These were all done by Kindergarten and Grade One Kinder: ruler with black crayons/ tracers, watercolor primary colors
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.