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!
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!