School mathematics. 3-6 classes. From tests to Olympiads

The second supplemented publication of the manual presents the tasks of thirteen open Olympiads "World of Mathematics" for schoolchildren of 3-6 classes. Detailed decisions are given to all the tasks of the Olympiads.
The second part of the collection provides tasks of testing for the elementary school and answers to them.
The collection is intended for independent preparation for the Olympics, the development of creative thinking.
The manual is addressed to students of grades 3-6, showing abilities and interest in mathematics, as well as mathematics teachers and leaders of school circles. It will also be useful for home training in solving mathematical problems with parents.
2nd edition, supplemented