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.
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.