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, 3 hours and so on.

Picking 14 items in a warehouse? You only need to count one at a time. There's a chance to speed things up by picking 2 packs of 6 plus 2 singles? Then the computer will print that on the pick list. No computer? Then the boss will print a sign with a lookup table like "14 items -> 2 six packs + 2 singles" and tape it to the shelf.

Trying to figure out whether you can get 9 people to lunch in two cars, one of which is kinda small? Add it up on your fingers, or keep your mouth shut and one of the other 8 people will figure it out.

Just don't get into board gaming :)

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.]

A jaw-dropping moment. Maybe school education is more important than we though.

If you are renting a hotel room by the hour, it is highly likely that the staff are poorly educated

The arguments against schools are generally made[1] by people who do not remember how it was before compulsory education.

[1]At least in Europe.

Not at all - you simply count hours using your fingers.