I think you can but you have to cut it and what exactly is involved with doing that I have no idea. I have just seen post from others talking about doing it.
you can use a nano sim in the ipad that uses a micro sim by using a sim adaptor (as poison Ivy mentioned) my carrier gave me one for free just before the iphone 5 was released but they wont cost much, you could probably buy 5 or more for a few bucks, or what ever currency you use.