Math Concepts: This is an adding machine! It is super simple to make and fun for the kids to learn about adding/composing numbers. It will help those kids understand the equal sign in a way they haven't experienced before.
Great idea for shape matching; can modify as needed for the little ones (Free shapes graphing activity. Practice shape recognition and learn graphing in a fun, colorful way. Kindergarten or Pre-K activity.
Magnetic number fishing, they add what they catch! As well as addition, develops hand/eye coordination, fine motor--I love this for magnetic letter fishing too! When they catch a letter, they say its name and sound.