DragonBox Numbers

Norwegian developer WeWantToKnow created an app where numbers are living creatures called Nooms that kids can cut, combine, and play with. Instead of memorizing addition tables, children physically manipulate quantities and discover mathematical relationships through tactile experimentation. The DragonBox series also includes algebra (for ages 5+!) that teaches equation-solving through puzzle mechanics so elegant that kids learn algebra without realizing it. It is the best math app ever designed.