Fortunately, on the 14th February 1966, I was only 10 yrs old, so we were never burdened with the crazy pounds, shillings and pence knowledge required to do a money equation, it was all base 10 and that was easy to work with .....
Unfortunately, by 1974 I was turning 19 yrs old, because some things are in millimetres, yet tape measures are in centimetres and rarely denote anything in metres, 3060mm is easily confused with 3600mm and vice-versa when reading a tape measure, it need one that also has the feet and inches on it so I can do the quick reference when transferring a measurement to the material to be cut ...... buying cheap tape measures that have two 8 cms on one and not on the other, caused all sorts of dramas when building big bus
The fact my brain damage from the accident only allows me to hold 4 things at a time in short term memory, I can't flip mirror image in my head, resulting in lots of things being built for a lefthand drive version of what every I'm working on at the time

very frustrating ...... might be part of why the metric measurements using a tape measure catch me out so often .... that and the need to measure from the 100mm mark to make a mm accurate measurement
T1 Terry