Could use with sliced logs. Giant Outdoor Memory Game for Kids - What a great way to practice sight words, math problems, matching and more for preschool, kindergarten and elementary age kids! Summer Activity for kids!
Clothespin Math on a clothes hanger! Easy to make, and self explanatory. I'm thinking a wire clothes hanger would work better, so the clothes pins are easy to slide back and forth (almost like an abacus).