# Grandpa's Crazy Math. Yes? No?

"This is really straightforward if you are from the other side of the pond", said Grandpa.

"Put your lateral thinking hat on and prove this to me:

Yes x No = VIIX

Being from US, this was not straightforward for me. How about you?

• How about you? I'm from the other side of the pond and it's quite foggy here. Note to others: rot13(farnxl rqvg #3 vf fhccbfrq gb pynevsl guvatf, fb V nffhzr guvf zhfg or n uvag) – xhienne May 11 at 13:48