expression, suffix
-th (fraction)
Attaches to a number to form a fraction denominator, e.g. ５分の１ (one fifth). Used in mathematical and everyday fractional expressions.
ケーキを３分の１に切ってください。
Please cut the cake into thirds.
この町の人口の約４分の１は学生です。
About one quarter of this town's population are students.