約分 [ㄩㄝ ㄈㄣ; yue1 fen1]
  reduced fraction (e.g. one half for three sixths)
  to reduce a fraction by canceling common factors in the numerator and denominator
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  約分
  やくぶん
  noun (common) (futsuumeishi)
  noun or participle which takes the aux. verb suru
  reduction of a fraction (to lowest terms)
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