We recited the Our father, Hail mary, all our times tables up to 12 times, and then the 12-inches-one-foot-three-feet-one-mile-one-thousand etc etc right up to 'ten chains one furlong, 8 furlongs one mile'
while the teacher did the dinner money and other stuff
So it was very handy later on in life but I still have to run very quickly through from hallowed be thy name to get 9 sixes.