I thought other crafty Gransnetters might appreciate this (link below). I have always said to my family when I'm knitting a tricky pattern "Quiet please I'm doing maths". (I was crap at maths at school, got left behind in class).
mentalfloss.com/article/86016/6-math-concepts-explained-knitting-and-crochet
Oversharing of personal information - have we reached the nadir?