Love this idea! It can be adapted to any grade level, students can demonstrate properties by making number sentences out of play dough. Or answer greater/less than questions etc. Built in manipulative for any concept.
These play dough counting cards are great for building math skills and developing fine motor skills. We put the counting cards on a cookie sheet and the children make small play dough balls to put on the counting cards.
Could also connect a bunch of locks and put all the keys on a key ring. Lots of pictures of latch, lock, etc ideas for montessori type preschool. This lock one could be made with 2 boards, some o-rings, and some locks from Dollar Store.
Clothespin Color Matching Strips ~ This is a great activity for eye-hand coordination … fine motor skills … and cognitive development. pattern strips and purchased color coding dots at Walmart and color clothespins.
Little boys will love the idea of working like daddy in the garage and everyone will appreciate the fine motor workout you can get from matching nuts and bolts. This idea (and several more in the same post) from Counting Coconuts.