Depends on whether she ever wrote it down. ^__~ She had a bunch of stuff in her head, like her sweater patterns. She knit top-down sweaters almost exclusively and she never had to make any calculations; just cast on the right number of stitches and made a sweater. ^___^ I had about six of the things as a kid. >_> Alas, I still have to do all the calculations on paper before I start or I end up with... something weird. O.o