Ben birinci oldum.
English: I was first.
In Turkish, 'sıra sayıları' are ordinal numbers. They show the order or position of something in a sequence, like first, second, third, etc.
Use ordinal numbers in Turkish to show order: for example, when talking about floors in a building, ranking in a competition, or the order of people or things.
Ben birinci oldum.
English: I was first.
O üçüncü katta oturuyor.
English: He/She lives on the third floor.
Bugün ikinci gün.
English: Today is the second day.
Beşinci soru çok kolaydı.
English: The fifth question was very easy.
Yedinci öğrenci kim?
English: Who is the seventh student?