Mental arithmetic. We count faster than a calculator

Is it possible to count in the mind faster than the calculator? For children familiar with mental arithmetic, this is not a problem! As a result of classes, students believe with lightning speed that four -digit numbers change in the mind and solve complex problems.
In front of you is the first practical book for parents and children in mental arithmetic!
Its authors, teachers of the international network for the development of intelligence and mathematical thinking Abus Center, created a set of techniques using a neuropsychological approach.
The book has many practical tasks and exercises with which parents will be able to captivate the child with mathematics and help his intellectual development.
Abus Center is 182 current schools in 25 countries.
Its teachers have prepared more than 30,000 students, of which 96 winners of the Pama Global International Olympiads. The achievements and records of students are often covered in the media