1001 Task for a mental account at school. Rachinsky S.A.

The unique task of the great Russian teacher S. A. Rachinsky “1000 and one task for the mental account” is reprinted with comments and reference material, illustrated by Russian painting and old photographs. Our book is for curious students and for teachers who are looking for non -standard moves in teaching children mathematics. The inquisitive mind is looking for new solutions, which means that after learning how to solve problems from the collection, the reader may also offer his own method of solution - simpler and more elegant.