The fucks this shit

[foxes-in-love]

[dajo42]

5001 being divisible by 3 doesnt feel right

[dajo42]

[shinyhappygoth]

Shortcuts to determine if an integer is divisible by:

This is a given.

If the last digit is divisible by 2 (a.k.a. even), then so is the whole number.

If the sum of the digits is divisible by 3, then so is the whole number. The recursivity of this means that if the sum has multiple digits, you can add them up again until you get a single digit and see if it's 3, 6, or 9.

Like the rule for 2, but check if the last two digits are divisible by 4.

If it ends in 5 or 0.

If the rules for both 2 and 3 apply.

No shortcut. Alas.

Like the rules for 2 and 4, but check if the last three digits are divisible by 8. (Yes, this pattern keeps going for 16, 32, etc.)

Like the rule for 3, but the sum of the digits (or the sum of the sum of the digits, etc.) must be 9.

If it ends in 0.

[noelements-setempty]

11. Put alternating + and - signs in front of each digit such that the last digit has a + sign (so for 5001 it's - 5 + 0 - 0 + 1). If the answer is divisible by 11, so is the original number. This is recursive like the 3 and 9 rules.

[unnatural-transformations]

7: Subtract twice the last digit of your number from the number you get by ignoring the last digit. If the result of that operation is divisible by 7, so is your original number (eg, 91 -> 9 - 2×1 = 7, so 91 is a multiple of 7). As with the rules for 3, 9 and 11 this rule is recursive (2261 -> 226 - 2×1 = 224; 224 -> 22 - 2×4 = 14; 14 -> 1 - 2×4 = -7 and so 2261 is divisible by 7).

It's not a fast way of checking if a number is a multiple of 7 (you honestly may as well just do the division), but it does work.

[cal3ris]

is this gonna get me fired you think

[lazer-exe]

I'm gonna say it, I do think that even the laziest person imaginable should have a roof over their head, food in their stomach, and access to healthcare

[foxes-in-love]

[fandom-man]

[charlesoberonn]

Two conclusions to be drawn from this picture:

1 - the geese in the background show that the fake coyote doesn't deter geese

2 - the fact they needed to put up a sign implies that the fake coyote did deter humans

[paverics]

“my father is a boy and my mother is a girl so i’m mixed” is the funniest possible response to someone asking your gender and it came from 6’5 Viking footballer and notable weird little guy Erling Haaland on a Snapchat

[paverics]

comedians can only dream of writing something this funny

[the-least-undefinable-ordinal]

I love when you read the early implementations of some algorithm and you're like "this makes sense, it seems like a reasonable way to extract truth from the universe". Then you keep reading and it goes "modern implementations represent a significant improvement over the Shit For Brains Method, whose usage is confined to computer scientists cooking eggs on their laptops. This one has the number 9801 as a load bearing part of the algorithm, the guy who came up with it claimed his god gave him the idea."

It really reinforces the theme that reality doesn't care all that much if it makes sense to us.

[garlend]

I like this quote that deals with the same kind of idea

[thevagueambition]

recently came across some plates and bowls that would be perfect for a children's hospital

[kittydesade]

ONE

SINGLE

JOKE

[digitaldiscipline]

[transgenderer]

i dont like how "trust-based" a lot of advanced math is. like, a lot of papers will at various points say "we did this calculation, and got this", (like, two steps in equation manipulation will be related in a very unclear way) and not show you the calculation. and i get it, typing up the calculation is annoying. but often, i will try to replicate the calculation, and will not be able to! and generally i assume this is because i am much worse at math than the author. but like. i guess i just have to take your word for it that the calculation works! this sucks! math isnt supposed to be like this! thats the whole point!

[werothegreat]

The worst part is when this happens *in a textbook*, i.e. the thing that is *supposed to be teaching you*. "The derivation has been left as an exercise for the reader" fuck you

[transgenderer]

yeah i mean the crazy thing about leaving it as an exercise for the reader without putting the answer in the back or something is like. if youre doing advanced math, theres a good chance an explicit derivation doesnt exist in public writing, literally anywhere.

[microsff]

When the selkie returned to the beach, a man was holding her sealskin.

"Is this yours?" he asked. "May I borrow it?"

"You want to be a seal?"

"No, but when I take it off, I'll be a woman, right?"

"My heart, you already are," the selkie said. "That skin is mine, but I can help you find yours."

[nondelphic]

writing isn’t hard. i just have to extract 80,000 words from my brain using sheer psychic force

[asteroidtroglodyte]

Quick shout out to the Down syndrome kid from my after-school program back when I was in grade school. Like yea he had the usual issues but he was a sweetheart and quite funny; and one day both his parents showed up at the same time to pick him up and I had the experience of meeting a family of genetically disabled people that had jobs and a home and a kid in school and it was a profoundly normalizing experience for me like I couldn’t take eugenicists seriously after that because like “no they totally can have whole entire meaningful lives with marriage and children and work and hobbies have you not met Dennis??” Anyway quick shout out to Dennis you were a real one

[cupcraft]

You never know what color pallette someone's Tumblr is till ppl are screenshotting posts and tags

[aropride]

do u like mine

[cupcraft]

Oh wow.

[cupcraft]

Some people on tumblr are reading ancient scrolls and you'd never know

[thehumantrampoline]

I kept forgetting my nighttime antidepressant so I set an alarm where the sound was a recording of me saying "HEY. TAKE YOUR FUCKING PILL" because I thought it would be funny. It was funny about three times, and then it started making me mad and I'd dismiss it right away to make it stop. So I handed my phone to my partner, who made another recording sweetly saying "Okay Shira, it's time to take your medication" and now I don't get mad anymore and I take my pill. The "compassion over punishment" camp has gotta get something wrong one of these days

[biggest-gaudiest-poltergeist]

wtf this is MY timeloop u can't be in here

[ailithnight]

Yeah, yeah. You said that last loop.

[foxes-in-love]