twonines
LIMERICUS
The old Imperial systems of coinage and measures made us so much better at mental arithmetic than our children and this was further compounded by the introduction of calculators.Didn't want to interfere with @Loxuru sad post above, but February 15th, this time 1971, 50 years ago, Britain formally introduced decimal currency.
I hope plenty of the Old Brits (you know who you are) can still work out the change from a pound for four articles costing ten bob, half a crown, a florin and a tanner.
I remember helping my son with his homework in the early 1980s and his refusing to accept that I could do the calculation in my head quicker than he could on the calculator.