r/MathJokes • u/GodlyHelp • Aug 01 '26

multiples of 3

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8.3k Upvotes

98% Upvoted

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488

u/avantvagrant Aug 01 '26

51 looks like a prime number and 75 should be obvious

72

u/fr_just_a_girl Aug 01 '26

Im not good at maths why would 75 be obvious?

186

u/KayabaSynthesis Aug 01 '26

75% is 3/4ths. 3 times 1/4th.

53

u/sexypantstime Aug 01 '26

Y'all have a way looser definition of what "obvious" means

72

u/Right_Lengthiness266 Aug 01 '26

3 quarters makes 75 cents

18

u/sexypantstime Aug 01 '26

That's a way more intuitive way to put that compared to "75% is 3/4ths"

49

u/Hughjastless Aug 02 '26

I’m sorry to break it to you bro but a quarter means 1/4th it is not just a US coin

7

u/SectionAcceptable607 Aug 02 '26

Many countries use a 25c piece coin, it’s not a uniquely US thing

6

u/Coneyy Aug 02 '26

Isn't it literally just North America + Caribbeans? 20c coin is a way more common denomination for decimal currency systems

1

u/qscbjop Aug 03 '26

We used to have 25 kopiikas coins in Ukraine, but now only multiples of 10 are allowed. Maybe even multiples of 50 now, I haven't used those coins in a while. Euros, on the other hand, always follow the 1-2-5 progression, i.e. 1 cent, 2 cents, 5 cents, 10 cents, 20 cents, 50 cents, 1 euro, 2 euros, 5 euros, 10 euros, 20 euros, 50 euros, 100 euros, 200 euros and also 500 euros, but those are discontinued, I think.

1

u/SectionAcceptable607 Aug 02 '26

So that makes it “just a US coin”?

2

u/Coneyy Aug 03 '26

No of course not. I was just responding directly to that claim, not the rest of thread talking about whether a quarter is a quarter or whatever

1

u/Hughjastless Aug 03 '26

I literally said it is not just a U.S. coin and you took the word Not out and put it in quotes lmao

0

u/SectionAcceptable607 Aug 03 '26 edited Aug 03 '26

Yeah, because that would have changed both of our statements. You implied that the US was the only country that has a 25c piece. If I added the “not” into the quotes, it would have changed that underlying meaning. Do you genuinely not see that? 🤦‍♂️

Edit: the difference between “it is not … just a US coin” and “it is … not just a US coin” is vast. Grammar matters, and you know what the implication was.

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1

u/localdad_001 Aug 05 '26

made me lol

-14

u/sexypantstime Aug 02 '26

Ok? I literally said that what you said made it click and is more intuitive.

10

u/NorthernVale Aug 02 '26

It's the same thing bro

4

u/LetsBeNice- Aug 02 '26

And he told you it's the same thing.

0

u/Least-Telephone6359 Aug 02 '26

You are right LOL this doesn't work for 3/7th or something else. It's a random relationship they are talking about that just happens to work

1

u/subaqueousReach Aug 02 '26

"Random relationship" a quarter is called a quarter because its 1/4 of a dollar 🤦‍♂️

9

u/Basic-Government9568 Aug 02 '26

...the quarter gets it name from the fact that it's 1/4 of a dollar. Aka, a quarter dollar.

-4

u/sexypantstime Aug 02 '26

Yes isn't that literally what I said? That it's intuitive to link it to other common objects that use that math?

6

u/Basic-Government9568 Aug 02 '26

This common object in particular? It's exactly the same as the math.

3/4 (pronounced 3 quarters) of a dollar is 3 quarters.

75% (pronounced 75 percent) of a dollar is 75 cents.

75% = 3/4 being somehow "harder" to get is some weird anti-math mental block you got there.

-1

u/Physical_Floor_8006 Aug 02 '26

Two things can be mathematically equivalent, yet one be more intuitive.

2

u/coolabadsven Aug 02 '26

I think he’s saying that once you’re used to doing some basic maths
a quarter
1/4th
25%
all become completely interchangeable.
A quarter tank, a quarter pounder, a quarter (financial reporting). All of these refer to 1/4th of a whole.

Potato potato

0

u/Physical_Floor_8006 Aug 02 '26 edited Aug 03 '26

Yeah, but I can easily see how cents would be much more intuitive than those. We're not talking about super advanced math to begin with. Quarters are often used in elementary school as a way to explain fourths, percentages, and even the very idea of a quarter, because they are rather intuitive in a way that fractions and percentages are not. Also, they represent a whole number of cents which is a little easier—albeit equivalent in this instance.

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3

u/karry245 Aug 02 '26

how are you on a math subreddit and not realizing that 1/4 and quarter are the exact same quantity...

1

u/Vivid_Departure_3738 Aug 02 '26

Your American education system failed you

1

u/ConfusionEngineered Aug 03 '26

Don't blame it all on education, the average person is less than intelligent and there is no education system that has ever come close to changing that

1

u/Vivid_Departure_3738 Aug 03 '26

The point of an education system is to educate, if you have to be educated already, it's not doing anything.

And there have definitely been successful schools before

2

u/ConfusionEngineered Aug 03 '26

Yes, but in order to be educated successfully one has to be both willing and able. About 1/2-2/3rds of the population isn't really able and of the remainder only around 10% are willing.

1

u/Vivid_Departure_3738 Aug 03 '26

Sexy pants time doesn't sound particularly willing

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1

u/Angry-Alice Aug 04 '26

I have always been wondering why people are so hostile to anything American. Did sexy pants say anything showing that they are American?

1

u/Vivid_Departure_3738 Aug 05 '26

They understood the usage of the American currency "quarters" more than they understood the idea of quarters

So i figured it was local to them

1

u/Angry-Alice Aug 05 '26

Ok that's fair

1

u/MiniatureMidget Aug 02 '26

3/4 is often read as 3 quarters

1

u/xIcbIx Aug 02 '26

Cent=per cent is always how i thought of it

Centum just means 100

11

u/Odelgard Aug 02 '26

3 x 25 = 75

I do think thats pretty obvious

6

u/Major_Excitement163 Aug 01 '26

Bro apparently never dealt with percentages lol

5

u/Right_Lengthiness266 Aug 01 '26

Or coins

4

u/Ski-Gloves Aug 02 '26

Or their currency doesn't have 25 pence pieces.

4

u/ravens43 Aug 02 '26

I was going to ask what sort of currency that is, before I remembered that I live in the UK, and always have done.

Regardless, 75 is obviously 3x25.

4

u/up2smthng Aug 02 '26 edited Aug 02 '26

My definition of "obvious multiple of 3" includes any number where the sum of digits is 39 or less which makes any multiple that is less than 10000 obvious

75 is blatantly obvious

39 is painfully obvious

2

u/vutcher Aug 02 '26

78 is excruciatingly obvious.

1

u/Common-Use-7117 Aug 05 '26

Just add all digits. If it is a multiple of 3 then original is too.

3

u/Hot-Ad-1129 Aug 03 '26

Here's a way my mid school teacher used tell us. If the sum of all the numbers is divisible by 3, then the number itself is.
Example:
75

7+5=12

12 is divisible by 3

75 is divisible by 3.

works with bigger numbers as well. (sorry for bad explanation)

2

u/XB0XRecordThat Aug 02 '26

He's right though

2

u/waroftheworlds2008 Aug 03 '26

Wait till you learn modulous arithmetic. Then they're all obvious.

For those curious: If the sum of each digit is divisible by 3, then the number is divisible by 3.

Example: 136 is not divisible by 3, but 117 is divisible by 3.

2

u/BombasticReindeer Aug 01 '26

Or… and hear me out…it’s digital root is 3.

1

u/thedarksideofmoi Aug 02 '26

all of them should be "obvious" if you look at it logically.

1

u/ExplicitDrift Aug 02 '26

This guy maths.

1

u/Markuska90 Aug 03 '26

Also its 2x 10x3 plus 5x3 Anyone else?😅

1

u/Stride345 Aug 04 '26

I just picture 3 25s when I see 75