WHEEL MATH + ADDITION APP DEMO with BADGES by MisterNumbers- 

play.google.co... Android FREE or apps.apple.com... IPhone/iPad download FREE App by MisterNumbers
Wheel Math+ is a Free App by MisterNumbers, collects no data, for 3-9 year old kids learning visual addition, families of numbers that add up to the same sum, and ALL create railroad lines (parallel) on a number wheel -30 Sec
This app is for kids, but really aimed at parents and teachers who want to share this amazing and unique visual understanding of addition with their kids. You will enjoy this app as much as kids do, and sets the stage for questions about numbers and patterns.