I assumed what a "Math Encyclopedia" card meant was kind of like what I once saw at the gentlerevolution.com website -
http://www.gentlerevolution.com/mm5/merchant.mvc?Screen=PROD&Store_Code=G&Product_Code=0520&Category_Code=BOTthey have these bits of intelligence for "polygons" and it gives 10 facts about each polygon shape - I thought those were very interesting and I know that creating something like that would be very time-consuming. I assumed that that's what Malathi meant.
Yes, I have looked at those other great quantity files you have mentioned and I use them for my son - they are very helpful, thankyou - I would like to do some files on things like that in the future, but it's probably going to be a while before I get to work on that