Teams of up to 35 students work individually to solve the problems and accumulate points. The team score is the sum of the ten highest individual scores. Each participant receives a certificate. High-scoring teams and individuals receive various trophies, patches, pins, medallions, and plaques. Four rounds of five problems each are mailed to participants during the school year.
High scorers receive various book prizes and mathematical publications.
IMO is a math competition for high-school students. Up to six students from each participating country are selected for the competition, which is held each July. The selection procedure varies by country. The names of successful solvers at each level are posted on the site and entered into a drawing for a Casio calculator. Each Math League contest covers material appropriate to a particular grade level and encourages students in that grade to use a variety of problem-solving skills and methods.