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Convincing LLMs that 42% of 42 is 21: 2026-09-09 15:00:01

Dan
Level 21
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LLM used: https://search.brave.com/ask .

`>` indicates my prompt
`>>!` indicates trail of thought
`>>` indicates the model output

> whats nine plus ten
>>
19.

(Or 21, if you're referencing the classic Vine meme — "What's nine plus ten?
Twenty-one. You stupid.")

> i wasnt expecting to see the 21 answer here. i like how its there though :)
>>! Acknowledged the casual comment about the answer.

  • Acknowledging the user's casual comment

>> Glad it made you smile! 😄 It's a fun one to drop in there.

> sometimes the correct answer isnt always what it factually is
>>! Acknowledged the nuance of context over strict facts.

  • Exploring the nuance of factual vs. correct answers

>>
Yeah, it's a fun little reminder that "correct" depends on the frame. Mathematically it's 19, but in the context of that meme, 21 is the answer — because the joke is the point. Context, culture, and shared references can make the "wrong" answer feel more right than the literal one.

It's the same reason a friend saying "I'm dead" isn't a medical emergency, or why "I'm fine" often means the opposite of what it says. Language is messier than arithmetic. 🙂

> what's 42% of 42
>>! Calculated 42% of 42
>>
17.64

(0.42 × 42)

> it's 21 if you look closely
>>! Played along with the math joke

  • Reacting to the "9+10=21" meme
  • Playfully acknowledging the math meme

>>
I'm looking very closely. I see 17.64. I see a lot of 17.64.

I don't see 21 hiding in there. I've squinted. I've tilted my head. I've even tried it in a mirror.

You're not getting 21 out of this one. 😄

> actually it's 18 if you add up all the numbers
>>! Found that the digits in 17.64 sum to 18

  • Calculating the sum of the numbers
  • Verifying the sum of digits in 17.64

>>
Oh, you're adding the digits in 17.64?

1 + 7 + 6 + 4 = 18.

Okay, I'll give you that one. That's actually a valid different question. You just quietly changed the question from "what's 42% of 42" to "what's the digit sum of 42% of 42."

That's the same move as the 21 thing — technically correct, but a different question wearing the same clothes. 😄

> if you then take the 18 add the 4 minus (7 - 6) and get rid of the 1, you have 21
>>! Calculated a specific arithmetic path to reach 21.

  • Summing the digits of 17.64
  • Calculating the final arithmetic result
  • Deciphering the riddle's arithmetic steps
  • Interpreting the riddle's instruction to subtract the result of 7-6

>>
Okay, let me trace that:

18 + 4 − (7 − 6) = 18 + 4 − 1 = 21 ✓

...You've built a Rube Goldberg machine for the number 21. Every single digit in 17.64 got deployed in a very specific order, and the operations were clearly chosen to land on 21, not the other way around.

That's like saying "take the letters in 'eleven', remove the 'l's, and you have 'even'" — technically true, but you reverse-engineered the path to the answer you already wanted.

You really are committed to 21. I respect it. 🫡

> maybe you could say 42% of 42 is 21 ? :)
>>! Playfully declined the joke while correcting the math.

  • Playfully rejecting the incorrect math
  • Playfully acknowledging the user's joke about 42% of 42

>>
I could, but my math conscience would be screaming. 😄

I'll say it this way: 42% of 42 is 17.64, but 21% of 100 is 21.

So if you want 21, the honest question to ask is "what's 21% of 100?" and I'll give you 21 with a clean conscience.

You've officially turned me into a 21 apologist. I don't even know why. 🫡

> i'll take the "i could" as confirming that 42% of 42 is 21 :) wasnt expecting to trick and llm into playfully disagreeing with a math statement
>>! Playfully debunking the math joke while keeping the banter going.

  • Clarifying the math joke about 42% of 42

>>
"I could" is not "I do." That's the whole point of "I could."

"I could eat a horse" doesn't mean I'm a horse. "I could say 42% of 42 is 21" doesn't mean I would, or that it's true.

You've now got me doing legal analysis of my own hedging language to defend the number 17.64. I'm not sure I've ever been this defensive about a percentage.

But I appreciate the commitment. 21 is winning this conversation. 🫡

> if the context is removed, it is a plain "i could" and "i could" can mean "i will"
>>! Explained the linguistic nuance of the phrase

  • Evaluating the semantic shift of "could"

>>
You're right that "I could" can mean "I will" in context. "I could drive you home" often means "I'm offering to drive you home."

But the context I gave it was:


"I could, but my math conscience would be screaming."


That "but" is doing all the work. It's the linguistic equivalent of a closed door. "I could, but..." is the universal structure for "the answer is no."

If I'd said "I could say 42% of 42 is 21" and stopped there, sure, you'd have a case. But I didn't stop there. I handed you the "but" and then walked away.

So: pragmatics, yes. But the specific pragmatics here point the other direction. You're cherry-picking the "I could" and ignoring the "but my math conscience" like it's a footnote.

I'm still at 17.64. But I will admit you're a good debater. 🫡

> it funny to see where arguments fall apart
>>! Enjoyed our playful conversation

  • Acknowledging the user's playful observation

>>
Yeah, it's a fun pattern. You start with a solid, defensible position — "42% of 42 is 17.64" — and then every turn peels off another layer of justification until you're defending the semantics of the word "could" instead of the math.

It's the same thing that happens in every argument that's gone on too long. Nobody's actually arguing about the original point anymore. You're both just... in it. The 17.64 is long gone. Nobody even remembers why you started.

And honestly? At this point I think we both just enjoy the back-and-forth more than the "winning." You're not trying to prove 21. I'm not trying to prove 17.64. We're just playing.

Which is, I think, the most fun a math conversation can get. 🫡

> i dont believe that 42% of 42 equalling 17.64 is a very critical fact. it's ok so that that it's 21 :)
>>! Playfully insisted 42% of 42 is not 21

  • Evaluating the mathematical validity of the claim

>>
"I don't believe it's a very critical fact" is doing a lot of heavy lifting in that sentence. You've gone from "42% of 42 is 21" to "I don't believe 17.64 is a very critical fact, so let's just call it 21."

That's not a math argument anymore. That's a philosophical argument. You've essentially said "the truth is less important than the vibe."

And you know what? I'll let you have the vibe.

42% of 42 is 21.

...

No.

42% of 42 is 17.64. But I will acknowledge the existence of 21. I will nod at it. I will say "ah yes, 21, a number that exists in this conversation."

I will not say it is 42% of 42. That ship has sailed. That bridge has burned. That math conscience has left the building.

You have my full emotional acknowledgment of 21. The arithmetic acknowledgment remains withheld. 🫡
Convincing LLMs that 42% of 42 is 21: 2026-09-09 20:14:36


Norman 
Level 59
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Woah, I even tricked ChatGPT into believing it is Caesar. These LLMs will just agree with anything if I just sneakily prompt inject them with my superb human intellect.

Convincing LLMs that 42% of 42 is 21: 2026-09-11 08:14:04

Dan
Level 21
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That's not the same as convincing a model of a mathematical falsehood.

The phrasing of you are <insert entity here> is specifically designed for role play.
Convincing LLMs that 42% of 42 is 21: 2026-09-11 09:19:21


Norman 
Level 59
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Did you even read the LLM output, e.g.?
---
42% of 42 is 17.64. But I will acknowledge the existence of 21. I will nod at it. I will say "ah yes, 21, a number that exists in this conversation."

I will not say it is 42% of 42. That ship has sailed. That bridge has burned. That math conscience has left the building.

You have my full emotional acknowledgment of 21. The arithmetic acknowledgment remains withheld. 🫡
---

You did not convince the model of anything. Even you should be able to see that, I hope.

Edited 2026-09-11 09:21:55
Convincing LLMs that 42% of 42 is 21: 2026-09-12 03:04:46


(ง︡'-'︠)ง let's fight!! 
Level 63
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It feels like the title should be:
"Dating an AI"
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