I was looking for some Maths paper when I was on Printablepaper.net, when I came across a ‘sister’ site: Printableflashcards.net. This website has free flashcards covering many different subjects/topics and is worth a browse.
The biggest selling point to me was you can create flashcards without requiring a double sided printer or cursing the photocopier for misaligning your originals. You don’t have to glue them (unless you want to) as they will stand nicely on the desk once they are folded, with the answer face down on the table. You can use the Flash Card Generator to create your own set of 4/6 (or multiples of 4/6) flashcards.