The Kangaroo Without Borders Association is an international organization with members from over 100 countries. Its main mission is to organize the international competition “Kangaroo Mathematics Competition” whose primary goal is the popularization of mathematics. The competition is held for students from primary to secondary school at 6 levels. Delegates from the countries that make up the association meet once a year to select the problems for the exams. These are chosen from a database of hundreds of problems, created in advance by the members themselves. The association is managed by a Board of Directors that takes care of the administrative part, supporting the member countries and managing the entry of new countries.

The structure of the association and the competition is presented, as well as examples of problems from the different levels offered in the competition. Several million students from over 100 countries participate in this competition, making it the largest international mathematics competition in the world.

The Association's fundamental goal of contributing to the popularization of mathematics through an activity focused on problem solving and critical thinking has become highly relevant today. Teaching mathematics has always been a challenge for educators due to the characteristics of learning this discipline, which requires, for example, knowing certain skills and concepts in order to understand deeper concepts. In other words, it requires step-by-step knowledge, where one step depends on the previous ones. The kangaroo mathematics competition presents a methodology that strongly contributes to learning mathematics and, above all, to fostering a love for this science. The problems posed in this competition are very special; games, situations, drawings, etc. are used so that the problems are not routine and are very attractive.

This model of international cooperation is a success that directly impacts several million students and hundreds of teachers around the world. In addition, other collaborative projects in mathematics education have been created through the association between teachers from the association's member countries. We present metrics that show the impact of this project on the school mathematics community.

Keywords: Mathematics, international cooperation, competition.