Mathematics. Dragon. A collection of engaging tasks for 3rd grade students

This notebook is a prize for those who solved the "PLUS" Olympiad. In this notebook, you will find problems similar to those we had in our Olympiads in December 2015, February, and April 2016. There are tasks about palace doors... and Greek numbers, about caves and the shadows of towers. And there are also new tasks in this notebook that you haven't encountered yet. Perhaps even adults won't be able to cope with all these tasks and find all possible solutions. Can you decipher codes and solve problems about carpets? Can you come up with your own problems using matches? Have you figured out how to outsmart the sage? We hope that these tasks will bring you joy.