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.
Have you tried this simple activity to build fine motor and number sense. Come check out it and 17 Ways to Build Fine Motor Into Your Curriculum. These activities are especially great for kindergarten and pre-school.
Tutorial: DIY Tissue Paper Pom-Poms this tutorial is pretty good. Use square sheets or tissue for a rounder Pom Pom. Tie the middle with ribbon and tied several on ribbon and hung them for a backdrop. Use thin tissue paper and fluff gently.
Stress Ball Balloons or For Pre-school Play. Make these playdough-filled balloons for improving fine motor skills and discussing emotions or including in your "Calm Down Kit." -tkz ( I LOVE THIS IDEA) :D