Try
In a blank cell enter 100. Copy this cell and then highlight the cells you
want to convert. Right click and click paste special select values and
multiply.
Are all your numbers 2 decimal places or are some greater. Assuming you
have a mix, put 100 in a cell, copy the cell, select all your values at once
and do Edit / Paste special / Multiply. Now format all the cells so that
you only see integers and then do Tools / Options / Calculation tab / Check
precision as displayed. Hit OK and then go back in and uncheck it. Note
though that you will lose any decimal data anywhere in that tab.