The Ateneo de Manila Grade School is the elementary education unit of the Ateneo de Manila University, and is the oldest unit in existence - Ateneo de Manila began as a government-run primary school during the Spanish colonial period. It is an all-boys school with a population of around 4,000 students. The school had implemented the K-12 program since the 2013–14 academic year. The Ateneo de Manila Grade School is one of the first elementary schools in the Philippines to adopt the Singapore math curriculum.