If you have ever tried to make a quilt without a pattern (and even if you have made one with a pattern), the chances are you have to put on your Maths head in order to get your noggin around the dimensions and fabric lengths etc. In fact, I had no idea before I started sewing how much I would be using my calculator!
Laura Laing has written a book which looks fantastic which is called Math for Grownups. She recently wrote a guest post on Sew Mama Sew which explored some of the basics of maths pertaining to sewing. You can read more at her blog Math for Grownups.