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Incredibly useful
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this post was submitted on 02 Oct 2025
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Microblog Memes
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can i get a hint on that last one
It's the same as 10+4
"Incorrect. 10+4 is equal to 14. However, 4+10 is equal to 14. So yes, 10+4 is the same as 4+10."
My daughter was doing math, basic second grade math, but the way they teach kids to solved math problems now is just not how we did it 30 years ago, and so when she has a problem, 9+8, and she's supposed to show her work, I have no idea the methods or anything that she's using and I am zero help to her.
Definitely not going to ask an AI though, that's silly.
That 9+8 thing holds true even when helping kindergarteners.
By "show your work" they mean "draw 9 blue pens and 8 red pens and then say you counted 17."
Teacher do it that way during class and wants everyone to do same but we don't have the context so us adults overthink it.
Yeah, this is some method of turning the 9 into 10, because it's easier to add 10 and 7 than it is 9 and 8, but I don't have enough info to help, because I just get told I'm doing it wrong by my kid. I was never into it either as a kid, but mental math would end up failing me later in life, so I'd like to help her, I just need more info!
Oh I've seen that described years ago in reddit. It surprised me back then but when I think about it, all my adult life I'll do that, by now, instinctively.
I think I also saw to break down e.g. 7+8 into 5+2+5+3.