Originally Posted by
NJ Quilter
There is also a small spiral bound book called Quilters Reference Guide. Has the answer to this and many other math questions as well as bed/quilt sizes, etc. Great little book. Under $10 I think and it's small enough to take along with you but large enough for 'mature' eyes to read. I find it an invaluable tool.
This is what I would suggest. It is easy to understand and well written. I know it was on Amazon ... probably on other sites as well.
ali