Mathematical counts for curiosity. Count from 0 to 20. With the transition through a dozen

Cognitive mathematical counts will help the child master the unmistakable addition and subtraction within twenty (with the transition through a dozen), develop the skills of the oral account.
In the book 12 of the counts. Tasks are built in the form of a game when a child moves from one chip to another. After solving all examples, he goes to the page with cognitive information about the life of the hedgehogs. Thus, each child not only gets the opportunity to improve his mathematical account skills, but also the opportunity to expand his horizons and get acquainted with interesting facts from the world.
A book and a mobile application are intended for children 5-8 years old and their parents