how to keep decimals from rounding

Is there a way to surpress round() or number_format() from rounding decimal places? I have a value of ".253338" being returned via a calc function. I take that value and multiply by 100 because I want "25.333" to be displayed. I've used round(), sprintf(), and number_format() and each of them rounds the value up. I had a problem with precision earlier which I solved...my 'precision' setting in php.ini was set too low. Is there something in php.ini that controls rounding? Any heads up are appreciated! Thanks, ~Rob