100.dan u školi je međunarodni projekt koji se obilježava sredinom veljače kao 100.dan polaska učenika u školu. Učenici obilježavaju nizom zanimljivih i poticajnih aktivnosti kojima se kroz igru i aktivnosti istraživanja broja 100, želi potaknuti ljubav prema školi, školovanju i zanimljivom projektnom danu koji provode. Projekt je jednodnevni i sprovodi se određeni (100.dan) u školi. The 100th day in u school is an international project that is celebrated in mid-February as the 100th day of students' departure to school. Students mark a series of interesting and stimulating activities which, through play and research activities number 100, aims to encourage love for school, schooling and an interesting project day they spend. The project is one-day and is implemented on a specific (100th day) school.