Try clicking on File/Page Setup and then make the margins smaller. I thnk you should also see an option "Fit to one page". Use this but if it is a big spread sheet it may make the print size too small to read.
I'm not 100% on Works as I use Office but if the above dosn't work let me know. I will have a look at the copy of works that came with this PC. (Anyone want to buy it ?)