Earlier quoted context omitted.
> it's not hard to understand that "3 + 5 = 8" is not something that you'd need to literally memorize ‘Literally memorize’ as opposed to what? Counting your fingers?
Precisely. Our entire society is organised so that even university graduates are very rarely called upon to sum two single-digit numbers. Adding up purchases in a shop? The till does it automatically. Admittedly, the cashier will need to be able to make up change promptly - but a customer needn't check their change. Paying for parking? There will be a sign listing how much money you need to put in for 1 hour, 2 hours…
Then if the maximum parking time is 3 hours, it's 10:15 and you want to know at what time you need to leave you take out a cardboard clock, set the current time, and advanced the small hand one, two, three steps. And to know whether you can afford both the parking and a coffee with the money you have on you you make two piles and keep the parking money in one pocket and the coffee money in another pocket. I got it. [I'm joking, our society is organised in such a way that you don't need to be able to read a clock or handle money.]