Remember when you were a primary school pupil, and your teacher told you you needed to be good at mental arithmetic because you wouldn't have a calculator with you all the time?
It turns out your teacher was better at their eight times table than predicting the future. But is that knowledge still locked in your head? Read more: Which Gogglebox gang are you in?
Find out with our personality quiz We've put together a maths quiz, with questions increasing in difficulty, of the level that would test a seven-year-old.
The question is, how would you get on? Are you good enough at mental arithmetic that you could split a restaurant bill without resorting to a phone app - assuming you're not with the sort of person who refuses to pay an equal amount because they didn't have a starter?
Read more on manchestereveningnews.co.uk