I added this picture from a friend’s old maths book because it made me smile.
I said to her, “I’ve added a bit from the answer page of your maths book to my napkin.”
“There was an answer page?”
Modern Mathematics For Schools by James Murray. Published by Blackie in 1972.
PS. Just a reminder that my June napkin will be exhibited at The Mall Galleries, 14-23rd November 2014.