I had to smile at your question because I made a quilt this year for my son who is in the Air Force. He was being sent to Alaska and I knew he would need a quilt! (I have made others for him, but knew he'd probably need several layers.) Anyway, it was a log cabin pattern and I decided to increase the size, and all the time I just kept buying more and more fabric (what fun!) until I realized that I had increased it much more than necessary. In the end I had enough blocks for his quilt, one for us (DH and me) and a 56x56 one for my DS and DIL. What can I say, I'm a librarian and obviously not a mathematician. lol