An overview of the Montessori baby visual mobile series. The visual series includes the Munari, Octahedron, Gobbi and Dancers mobiles and are the first work for infants from birth until they are several months old.
I think you could also have multiple pipe cleaners coming from one number and students have to show multiple ways to add numbers to get to that number. Counting with pipe cleaners and beads. Great for fine motor development too.