Hmm maybe I explained it badly, it's not that we don't have the concept of "tens" with Arabic numerals, but more like "a ten" being just as countable as "a one" I guess? Like the problem was that the math lessons had diagrams of little squares that represented "ones", and longer rectangles that represented "tens", and you had to figure out what number it added up to. So all of international students were used to already saying 20 as "two tens", and the rectangles made sense to them, but the kid speaking English couldn't understand the difference between the squares and the rectangles. Like he understood each of them as being "one" shape, so he didn't have the concept of one rectangle = 10 ones yet. I remember that was something that took me a really long while to fully understand as a kid too, so it must be kind of helpful to learn that concept really early on from language.
People who make up their own medicine/science are so frustrating
I can't even imagine arguing that cancer is a good thing, and yet you hear about stuff like that all the time.
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