Here is a worksheet on the Greek roots a and an. They mean not and without. These are, of course, one of those exceedingly common prefixes in English that students learn early on in phonics instruction.
They yield, on this document, important science words (they commonly appear on the SAT, if the author of the dictionary from which I drew them can be trusted) like anaerobe and abiotic, as well as frequently used words in everyday discourse like anonymous, asocial, and apathy. Of course you can do anything you want with this page as it is formatted in Microsoft Word for ease of differentiation and adaptation.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.