Mathematical account for curiosity. From 0 to 100. The fourth level. Book with a mobile application

Tasks in this book will help the child master the unmistakable addition, subtraction, multiplication and division within a hundred, develop the skills of the oral account.
On the pages of the manual, chains of examples are given that are solved sequentially. It turns out an analogue of the game when the child moves from one chip to another. After solving all examples, he goes to the page with cognitive information about the life of badger. 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 7-9 years old and their parents