##
frac14 => chr(188),
frac12 => chr(189),
frac34 => chr(190),
##
##
# switch package
package HTML::Entities;
$entity2char{frac14} = '.25';
$entity2char{frac12} = '.5';
$entity2char{frac34} = '.75';
# switch back to your package
package main;
# go on with your code