For a real number 
, the mantissa is defined as the positive fractional part 
, where 
denotes the floor function.
For example, for 
,
the mantissa is 0.14159.
Mantissa
See also
Characteristic, Floor Function, Fractional Part, Scientific NotationExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Mantissa." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Mantissa.html