The largest unit fraction, 1/2.
1/2 is a rational number with terminating decimal expansion 0.5.
Half
See also
Critical Line, Pandigital Fraction, Quarter, Square Root, Unit Fraction, UnityExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Half." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Half.html