既き約やく分ぶん数すう

noun

irreducible fraction; fraction in lowest terms

Mathematical term for a fraction whose numerator and denominator are coprime (i.e., cannot be simplified further).

• 三さん分ぶんの二には既き約やく分ぶん数すうですが、六ろく分ぶんの四よんは既き約やく分ぶん数すうではありません。

  Two-thirds is an irreducible fraction, but four-sixths is not.

• 分ぶん数すうを既き約やく分ぶん数すうに直なおすには、分ぶん子しと分ぶん母ぼを最さい大だい公こう約やく数すうで割わります。

  To reduce a fraction to its lowest terms, divide the numerator and denominator by their greatest common divisor.