Asia-Pacific Primary School Mathematics Olympic Invitational Tournament. The Asia-Pacific Primary School Mathematical Olympiad Invitational Tournament evolved from the Singapore Primary School Mathematical Olympiad. From 1990, it will be held once a year, referred to as the Asia-Pacific Cup. Due to the increasing scale of the competition, some countries and regions in the Asia-Pacific region have gradually sent teams to participate in the competition, and now it has become one of the most influential primary school mathematics competitions in the Asia-Pacific region.