I actually did a lot of reseacrh on the abacus and the barcode links. I am a bagger and i always wondered about the barcodes. Now i am informed. I do like the exercises that are offered. they are placed after a certain subject is explained. Sometimes they are included in the detailed explanation. I like to have that becuase its like a school lecture. u get a formula and leanr how its used, then teacher gives u a problem to solve form what u just leanred.
Time spent reviewing site:
I spent about 20-30 minutes reviewing some of the links within this site.