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Said by someone who never actually told that to a teacher, lol.
OPs description is literally the simplest example of the dreaded “new math” they are teaching in schools.
9+7 is the same as 9+1+6 is the same as 10+6 is 16. New math. Same as the old math.
A very good song by Tom Lehrer as well.
This is actually how my professor, who has a PhD in mathematics, does math.
not even ADHD related you’re just taking a route to something more readily available in your memory. that’s how brains are supposed to work.
to me the detour is -1+10. whenever i see a 9 i take 1 away from the other guy and then add 10.
9 x single digit mumber works similarly; except i take away 1 and complete that to 9 by adding a number next to it.
9x7 = ?
7-1 = 6
6+? = 9
9x7 = 63
9x7 = 70 - 7 = 63 in table of 9 too easy ! (nearly the same technic)
8x7 = 70 - 7x2 = 70 - 14 = 6 + 70 - 20 = 56 (6 from 10-4 from 14)7x6 = 5x7 + 7 = 70/2 +7 = 35 + 7 = 42 the answer to the life, the death and all the rest (5xa = 10/2 x a= 10a/2)
No take one from 7 and its 10+6=16
This is how I think for sure.
Take 7 from 7 and its 16+0 =16
Take 11 from 7 and it is 20-4=16
My maths teachers encouraged that kinda calculations tbh… Makes sense why I like maths
It’s basically “common core” math (in the US), or just “updated curriculum” everywhere else in the world. Turns out that building fluency with math through play and number decomposition is incredibly powerful for long-term learning.
You are probably young then. Probably schooled post 2011 when common core started being implemented.
Hmm no I’m not
Maybe you got lucky then, because when I was a kid, rote memorization was the only way teachers would accept the answer. If you changed the problem to 10 + 6 or the one op posted, the teacher would tell you that you did it wrong. This is why I just decided to do this regrouping in my head and just write what the teacher wanted because I would get the right answer anyway and not get told it was wrong.
Oh yes very lucky!! I had some really amazing teachers. they really made me enjoy maths and science and all that hard shit, and rewarded that kinda thinking. Cause what you just mentioned is so demoralizing
Even had a maths teacher who was kinda a prick (for other reasons) but he was the one that encouraged that kinda thinking the most
I’ve always done it this way and don’t have adhd
Me: so 9 is 10-1 so you can do 10+7=17 and take away one so 16
I think this is precisely how math is taught through Common Core now.
Actually, no. One of the core goals of the US Common Core math standards is to make explicit this type of compensation strategy. One of the main ones emphasized for addition/subtraction is ‘taking from/completing a ten’ but there is a lot of work to help kids internalize these kinds of doubles strategies!
Ever think that maybe this person was schooled befor 2011 when common core math was implemented?
Is this engagement bait to get all the people who do it differently because it worked lol
Why wouldn’t you just take 1 from 7, add it to 9, and make it 10 + 6? That makes a lot more sense to my brain at least.
Because making shit equal, be in perfect balance or even symmetric makes my dopamine go 🥳.
Finding the correct answer that way is a neat side effect too.
Because that is the joke and why the teacher reacted that way.
Or translated into reddit: woosh
He’s a spider monkey with base 8 fingers.
AI does this like someone having ADHD while on meth.
Just wait until you find out what people with ADHD are prescribed
My retarded ass: 9 is 0b1001 and 7 is 0b111, 0b1001+0b111 is 0b10000 which is 16.
Am kidding, I take 9’s ten friend, sub-stract that from 7 et voilà I have 6 ones and 1 ten which is 16.
You’re so adhd you forgot that this was a whole part of your math curriculum that you just tuned out because you already knew it.
More likely this is a person who was at school pre-2011 when common core was implemented.
I do it like 7-1=6 and 9+1=10 and 10+6=16
This is encouraged in ‘new math’! Kids are explicitly taught and validated in using these compensation strategies instead of feeling like they are doing something wrong.
Well that would have helped me back in the 2000’s when i was told i worked out maths problems differently to everyone else with this sort of method even though i got the same answers. One teacher had me show my working out for a bunch of problems to understand how i was doing it and it made me internally feel bad at maths because i did it ‘wrong’.
Borrow 1 from the 7 leaving you 10 and 6. This is what they tried to teach in schools for awhile but adults weren’t getting it. Common Core? Is that what they called it?
As someone who learned not via Common Core, and then found out Common Core taught math how I taught myself to do mental math I was a little envious that kids would learn my “easier” method.
Same, common core is what I came up with to do mental math.
Yup, helping my kiddo with the math portion of Common Core was like seeing professionals finally understanding how easy it is to sort numbers to make stuff easier instead of doing a bunch of rote memorization of tables. Also teaching kids to estimate to know if your math is way off!
Common Core for math was awesome. That was the only one I had to help with so no idea about the rest.
Well it’s good for some shorthand but anything complicated you need either a calculator or do it long hand. With calculators everywhere they may have just switched to “hey fun mental ways to think about it because no one does long hand anyway”.
No, the same fundamental concepts works extremely well for multiplication of large numbers and long division, both of which don’t have a memorization option. It also helps with catching typos when using a calculator.
Easy long numbers yes, complicated long numbers I’m gonna say no. I’m not even saying large numbers, I’m saying long numbers which can include decimal points. And the chance of mistakes goes way up. There’s no point of doing it mentally or by hand when calculators are ubiquitous. I think this is why they switched to different ways of thinking about math, rather than hard core hand calculations that no one is going to do anyway.
Decimal points don’t make it more complicated when you understand the fundamentals.
Using a calculator is not a different way of thinking. You have to understand the math to know whether the calculator is being used correctly, the calculator just makes it faster.
Yeah, when I went through school they didn’t teach it this why but that is what I taught myself, much more simple math (+ & - with no * or ) in the same amount of steps.
Is that what they call Common Core? I’ve heard the term but didn’t know how it changed the method of teaching math.
Leave it to my AuDHD brain to figure out a less strenuous path to the same endpoint…
I wonder if this is an anxiety source for ASD/ADHD/AuDHD people. Having to constantly re-map lessons taught to fit my neurodivergent brain that it now feels like the entire neurotypical world is gaslighting neurodivergents.
Just a heads up, your \ got absorbed by the text markdown Lemmy uses. You have to use a double slash to have it show up, like this
\\.Oh, thanks so much for the heads up. I didn’t know that!
Sure thing! It’s not a particularly well-known thing, tbh, so it slips into comments now and again.
Fixed, thanks again!
Is that what they call Common Core? I’ve heard the term but didn’t know how it changed the method of teaching math.
Common core showed multiple ways that were intended to increase the understanding of how math works. This was one of the ways that was presented which wasn’t how they taught it when I was a kid. There were at least two that I remember when my kiddo was doing common core:
- Double one of the numbers and add or subtract the difference between them (7 is two less than 9, so 9x9 then subtract 2)
- Take enough from the smaller number to reach 10 and add what is left (9+7 to 10+6)
One of my wifes friends was an elemetry school teacher when common core was popular. We asked her what it was and as she was explaining it, i said, “oh, like how you do mental math?”
Im an engineer and i just assumed thats how everyone did math… apparently people just memorized everything
