Funny you should ask!!!
I told my 21 yr old last night that how they are being tought now in school about maths, to me is very weird?
I asked him could I teach him how they did it back in the 60's.
I could 'hear' him rolling his eyes, no need to see!
''Oh yes Mum if you must was the reply''...with which I said 'well make it soon'' or you could miss out.(By the time he is ready I will be long gone).
I Love numbers, and was good at school with math.....So I told him, well I will teach my grand-kids, if he doesn't want to learn.Young people who serve at the checkout, can not use their heads to add up.They need a calculator.
We didn't have calculators when I was their age?..we had to rely on the grey matter.