Hi,
I think the ones you bought have 40 (forty) 2.5" strips. The strips are the wof, usually 42-44"..
As far as how much that is in yardage, the MQC website says 2.77 yards for a 40 strip jelly, and 2.9 for a 42 strip jelly.
There are lots of free patterns for jelly roll quilts. Do a Google search, search here on QB,
etc.
http://www.google.com/search?ie=UTF-...th+jelly+rolls
On the pattern you posted, since it's 1.5" strips, I think you'd be better to get a honeybun. They are like jelly rolls, only the strips are 1.5".
By the way, the jelly roll you bought has beautiful colors!
Regards,
Kif