Jim Chimmerney
Can hear the 'Cod Army' roar from his back garden
That's a bit advanced. I've had students come to me in the cash office who can't add five figures together on a calculator correctly. Embarrassingly, they're usually in the Maths society. It never fails to amuse.
Ask them to work out a percentage on a calculator without a % button and they're stumped.
I'll never forget ordering 2 chip butties at the Lane a few years ago, they cost £2 at the time and the poor girl reached for the calculator.