When they realise that the numbers don't add up, Thirsty Dave's teaching days might well be numbered

In the beginning George Lucas created Star Wars and Thirsty Dave, like the rest of us, liked Star Wars. Lots of stuff happened and Mr Lucas decided in his non-infinite wisdom to create Star Wars prequels. Thirsty Dave, like the rest of us, wasn't happy with this at all and decided to rebel by becoming a Maths teacher. Nobody knows how or where he earned the right to call himself a Maths teacher but we have a feeling this question is about to asked very shortly: