are people really so bad in math these days they can not add 2 numbers in their head
I hate to break this to you but these days, not being able to add two numbers in one's head is the average.
*plays Chopin's funeral march on piano*
Of course, I can add 20 large numbers in my head or multiply two, even divide ...with decimal points ...whilst riding my bike ...drunk. *GG* -- I used to always do that on my way home when drunk to prove to myself I did not have too much alcohol. When I tell this to people -- or I memorize several telephone numbers on the spot -- I get protruding eyes like I was Einstein even though, technically, this *should be* grade school level (not the drinking part, duh!) IF, yes, if we were properly trained and not merely somehow brought up to the next grade with bare minimum everything.
At the end of the day, quite litereally, the question for me is: Do I *want* to? ^^