My brain isn't designed to do maths (or to use DVD players, drive cars, change light bulbs or set up computers i.e. basically anything I can persuade someone else to do as they do it so well...)
I became aware of my mathematical shortcomings when fairly young. At primary school we had a maths test every Monday morning. I didn't mind the test itself as it gave me uninterrupted time to think about books or food , but I hated it when we went through the answers. The headmaster (who taught the top class) would read out the question - something like 'If it takes 20 men 50 years to fill a bath containing 45 gallons with a tooth mug how many months will it take a old man armed with an egg cup' or some such nonsense. He would then look a round for the child least likely to know and then demand an answer.
I grew wise to this and just before 'answers' I would put up my hand and ask if I could go to the lavatory. I would then hang around in the lav making origami animals out of paper towels until I heard the lunch bell ringing and then reappear in time for goulash and jam roly-poly.
I probably got away with this for about six months before the HM asked my Mum if there was something wrong with my bowels.