Instant arithmetic. Mental arithmetic manual and logic

Mathematics is a very interesting subject. But unfortunately, not all children are given easily. Often the cause of poor performance in mathematics is a discalculia. Mental arithmetic and an eidetic approach to studying numbers allow you to solve this and many other reasons for the misunderstanding of mathematics.
The main advantage of this manual is an interest in mathematics that arises when meeting this book. And exercises for memory, attention and logic make it possible to make the process of studying fascinating and easy. Thus, this book will help not only to teach to consider, but also to comprehensively develop a mathematical mindset, that is, to improve the logical, critical and analytical thinking of the child