Duolingo has math now (and it’s kind of hard)

theverge.com

5 pointshydrolox2 comments

I would love this sort of thing for brushing up on calc.

...was the author serious that they draw "5" backwards? As an adult?

Imo the better alternative that is "Duolingo for math" would be Khan academy. it has calc and other math (although it's not amazing past calc).

Probably joking since they type 5 on a computer and would've read it.