The
International Mathematical Olympiad (
IMO) is an annual six-problem, 42-point
mathematical olympiad for pre-
collegiate students and is the oldest of the
International Science Olympiads. The first IMO was held in
Romania in 1959. It has since been held annually, except in 1980. About 100 countries send teams of up to six students, plus one team leader, one deputy leader, and observers.