What are the two 'sides' of a decimal number called? Is there a fancy name for the "left side" and "right side" of a decimal number?  

(That is, the pre-decimal part and the post-decimal part.)
We really do use "integer part" and "fractional part" respectively: see Wikipedia, e.g., on decimal fractions.


  The integer part, or integral part of a decimal number is the part to the left of the decimal separator. (See also truncation.) The part from the decimal separator to the right is the fractional part.
The left side of the decimal is called whole number and the right side of the decimal is known as decimal.