10 + 7 = 17 17- 1 = 16
this post was submitted on 03 Oct 2025
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This is the way
Your teachers are bad at their job. There is nothing wrong with that method. Now, if you also try to do 7+3 as 5+5, you might need to learn other method so next time, you choose a more efficient one. But against that would not be wrong.
Especially since the thrust of the new math curriculum seems to be more about being nimble with numbers and being able to conceptualize and compartmentalize their values rather than learning rote formula.
This is psychopathy. Clearly you just add the 1 to the 9 to make it 10 and subtract it from the 7 to get 6 and 10+6 = 16.
Holy shit.
Is that not how “normal” people do math in their head? How do they do it?
I have no idea how normal people do it but I do
9+7
One shy of 10+7
One shy of 17
16
How do they do it?
I assume they just don't. For my mom at least, she absolutely will not apply mental effort to anything that doesn't strictly require it. If a mental task can be offloaded to someone or something else, she'll do that instead, every time.
9 is one less than 10, and 7 is three less than 10, so combined, they're four less than 20 = 16
I used to work at a gas station, and I was always giving different amounts of change, and so I accidentally memorized every single possible combination of digits and coins from 1 to 99.
I no longer have to think, I have a lookup table.
The legend said that it is how Gaussian elimination was discovered in europe
That’s the most logical way! They are the heathens!
Is this engagement bait to get all the people who do it differently because it worked lol
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.
As long as your method gives you the correct answer, I see no need to correct anyone.
lol yep, precisely
Idk I have adhd and my working memory is so poor that memorizing time tables was the only way. :/
AI does this like someone having ADHD while on meth.
Just wait until you find out what people with ADHD are prescribed