A fraction 
written in lowest terms, i.e., by dividing numerator
and denominator through by their greatest
common divisor 
.
For example, 2/3 is the reduced fraction of 8/12.
Reduced Fraction
See also
Common Fraction, Complex Fraction, Fraction, Improper Fraction, Mixed Fraction, Proper FractionExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Reduced Fraction." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ReducedFraction.html