Sweet Sounds of Kindergarten : Math- Addition Cups! Cups have holes in them so that the manipulative a drop through. The kids use white board markers to write the numbers.or Velcro cups so students can dump in bottom
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.