Curated Tumblr

This picture just describes the 'new math' that everyone bemoans.

7+9=7-(10-9)+10

This kind of feels like how I constantly get the "which word/shape/number (etc.) in this series is incorrect" questions on tests wrong. I severely overthink it. "Well, these four all have chloroplasts and this other one gains energy from photosynthesis via a symbiotic relationship with another organism, so it must be that one."

*Gets test back*

"Oh, it was the one that didn't live in a rain forest."

I explained to a teacher one time this as my method, the get to ten version, and she looked confused as hell like why would anyone do that. She was cool with it though, gave me a whatever works for you kind of response.

9+7=10+7-1=16

I like the way the second ADHD method is also a flip on the "seven ate nine" dad joke

I think that third one down is actually how they’re teaching it at my kids’ schools now. It’s called “making a 10” I think, basically that same idea, add up to 10 first, then do the rest.

Me, bad at math: yeah they taught us that as a way to do in grade school.

Okay this is nice and all but how do people do 3974* 438 mentally, without paper? And bigger and some outright freaks seem to do it in an instant