Originally Posted by Peckish

I suppose you could always make one copy at 112 and another at 113, then lay each one on top of the other and hold it up to the light to see how accurate it is. At 1.125, the 5 represents thousands of an inch, so in my humble opinion, it won't make that big of a difference.

edit: I just asked my husband about this question. He works for a large photocopier manufacturer and therefore has extensive knowledge regarding copiers. He made 2 points: First, the difference between making a copy at 112% and 113% will be fractions of a millimeter. Second, photocopiers never make exactly 100% the same size anyway. He said you can make a copy at 100%, and it may turn out to be 100.5% of the original horizontally and 99.5% of the original vertically.

So, the short answer is it doesn't really matter if you round up that 5 or not.