Yang botched it by chaining = wrong.
100 − 10 = 90 + 9 = 99
❌ cringe
100 − 10 = 90
90 + 9 = 99
✔️ based
this post was submitted on 11 Apr 2025
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Some bureaucrats in Mexico City tried this years ago.
An important ring road had two lanes in each direction. To increase its capacity, they didn't actually widen the road; they just repainted the lane markings to turn two lanes into three, and claimed a 50% capacity increase!
Everyone immediately screamed about being crammed together just centimetres apart, accidents increased and the city officials quickly u-turned; they repainted to have just 2 lanes in each direction again.
But they then tried to claim that as that was a 33% decrease, and that because they had earlier increased it 50%, that meant they had achieved a net 17% increase in the road's capacity!
Don't they teach math in the US anymore? Or do you get a pass on basic subjects if you are on the football team?
No they definitely teach math but unfortunately math is kind of useless when they don't teach critical thinking.
Because then people blind themselves with their own bias and refuse to actually critically think about what they're reading and realize that they misread it or misunderstood it.
Goddamn I'm glad I was in Gifted
These people have no fucking clue what they missed
I was lucky to go to relatively good public schools and do some extra classes as well. It’s unfortunate that a good education is locked behind being wealthy enough to live in a good area and additional instruction outside of school, sometimes. This is one of the things that shows that people are not on a level playing field in the US.
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Practice is important. People definitely learn this level of math, but not using it for years dulls the senses. On top of that, lots of people scrape through school doing the bare minimum. (Not always their fault of course. Not everyone has ample opportunity to excel in school due to a variety of things.) From what I hear, the bar for graduating high school is not incredibly high, so people like this don’t surprise me.
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You get a pass on pretty much every subject because the school's interested in churning out worker drones rather than thinkers. Do this long enough and you get Trump supporters.
Heck, for a while, we insisted on passing kids no matter what so they weren’t “left behind”.
They teach math from like 6th grade up as if every middle schooler in the land is going to grow up to be a sweater wearing chalkboard writing mathematician when they grow up. It's taught as a series of arbitrary rules to follow. Here's some squiggles, and now you do this to the squiggles. NO you don't do that to the squiggles, do you want to be a ditch digger you fucking waste of sperm. You do THIS to the squiggles. Can't you FUCKING tell the difference you little cuntpuke? You use the Crendicative property of intiplicity. No, it's not five, it's negative three. It's obviously negative three, What idiot would get five? I know you got five and not some other number because this is designed to be a trick question. There's only one point in this big long procedure that matters, if you decide correctly you get negative three, if you decide incorrectly you get five. And you got five.
They do this to you for your entire adolescence.
So you're bad at maths and extremely bitter about it. Ok.
I actually learned math in physics class. Because in physics class, the equations mean something. They represent a relationship between things that you can grasp. There are built-in sniff tests. You can go "Wait, the ball rolled off the table and then...started moving toward the ceiling? That's not right, where did I...Oh I subtracted a negative number, I should have added a negative number."
From Kindergarten up to about middle school, they teach by practical example. "You have two apples, and you buy two more, you have four apples." "If you have two pizzas, each cut into 8 slices, you eat 5 slices from one and 6 slices from another, how many pizzas do you have left?" That stopped entirely in middle school to be replaced with "Here are abstract rules to apply to abstract numbers, and instead of explaining why here are paragraphs of "proofs" written in a logic system we won't teach you anything about and therefore mean nothing to you, memorize it verbatim so you can write it on the test."
Yeah I'm not compatible with math class as I've seen it taught. I can do math when it means something. Arbitrary meaningless bullshit busywork full of gotchas? Nah, I'm not doing it.
My third grade teacher told me that negative numbers didn't exist because having less than zero is impossible. I think I'm justified in being bitter about my education.
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TBF Yang really did write the equation in the sloppiest way possible.
Like I know what he MEANS but no math professor in the world would let this shit slide.
Yeah if you put it:
100 - (100 x 0,1) = 90
90 + (90 x 0,1) = 99
It comes quite obvious. And I know the brackets are redundant, but my coder mind forces brackets to all math formulas for readability.
Was it on purpose, maybe.
Even
100 - 10% = 90
90 + 10% = 99
Works better than what he did, because that’s how you’d enter it on a standard calculator.
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I think of it as
100 x 0.9 = 90
90 x 1.1 = 99
Am I the odd one out?
Percentages for show, decimals for a pro
Shameless plug for Engineering Memes community ported during the great API migration: [email protected]
Yes.
But also, Barqs does have bite.
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Decimal commas ain't 'merican: you'd totally throw them with your weird euro math.
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It's twitter, why'd anyone put effort in what they write.
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Brought to you by the same people that can’t explain tides
Tide comes in, tide goes out. You can't explain it!
Bread goes in. Toast comes out. It’s a mystery!
Magnets, how do they work?
Nobody knows! Like how you can only see the effects of the wind, but can’t see or explain it.
That knowledge is probably locked away in the 90% of our brain we don’t use.
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Both sides are right in a way. It just depends on what you're comparing the +/-10% to
This is clearly about the US stock market crashing. In that case it's always the days gain/loss, in which case Yang is the only person who is right.
This is important because a lot of people saw "down 10%" and now "up 10%" without realizing that's still day over day loss.
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Percent increase/decrease is change/original.
That is the difference between percent and percentage points.
I might as well throw the same comment in here. You learn this pretty quickly when you bet on meme stocks. Down 90% then up 100% I can assure you, you are no where near where you started.
Same with crypto. You'll get a notification something went down 10%, then up again 10%, but if you zoom out you see it's just been slowly going down on average since the last huge spike.
pegglegg back in fifth grade: 'why i need to learn this math stuff. i aint never gunna use it'
It's not that you will regularly have a calculator in your pocket
Checkmate
you still need to know what buttons to push on the magic box, and in what order...
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Yeah he totally cooked Yang. That guy has NO IDEA where the 9 came from.
Not even close to that anyway, the dow jones for example went from 44k to 37k back up to 40k. Still hasn't even regained half the value it lost.
It's only the same if it's up 10% compared to the original number. It all depends on your time period, you could be up 30% compared to 7 years ago.
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