[delusional]

> I just do the quick math in my head. And the only way I can do that is because I learned how to do math.

A lot of Hacker news commenters tend to overestimate human ability without education. That is, the tend to believe that people are able to do a lot more without regular training than they actually are. They believe that "math" is some naturally ordained eventuality that humans just do, or likewise that "reasoning" is some immutable natural behavior. In truth these things are "unnatural" human reinforced structures that we have to learn and adapt our brains into.

[Rendello]

I'm abhorrent at arithmetic and I think it affects me greatly. I know quite a few people who are barely literate and manage to get by in life, but it obviously makes things hard for them and strips them of opportunities (and they forego holding any identity that seems to "smart" for themselves). I think numeracy is similar.

I wonder how much better I could become as an adult at mental math. I did a math course a few years ago (Math Academy) and put some effort into improving my addition, subtraction, division, and multiplication, but I wish I'd done more up front. Even one-figure arithmetic is so fuzzy to me, like it's a hashtable where the keys don't line up to the right values. Can I unlearn that now? O(1) doesn't matter if the result is wrong.