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[-] some_guy@lemmy.sdf.org 5 points 12 hours ago

Well, the Roman numeral M is 1000, so this is a pretty good tip. Not sure about the rest, but hey I'll take.

[-] Imgonnatrythis@sh.itjust.works 20 points 16 hours ago

I'm good at math except after more than one drink. Ngl, I really like it when the bill has a list of percentages and totals to preview. I'd like it even more if we just charged what food and labor cost and got rid of this nonsense though.

[-] BigDiction@lemmy.world 4 points 11 hours ago

Move the decimal one place left and double it for 20%. Do it for the sub total if you prefer not to tip on tax.

[-] hereiamagain@sh.itjust.works 2 points 3 hours ago

Been doing this for years. I evangelize it all the time, and people still don't understand, or they try to make it more complicated than it is. But it's literally THIS easy, so easy. It's not even math at this point, especially if you only double the dollar amount and ignore the change, a kindergartener could do it.

Yet people refuse to learn a "new weird way".

You don't have to understand it, just do it. This is literally the easiest way. I will die on this hill.

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[-] Lighttrails@sh.itjust.works 44 points 21 hours ago

I expressed my displeasure of these tickets at a bar I work at to one of my coworkers. They then pointed out that in Toast POS you can just punch in the total bill and it generates the tip for you

[-] JoMiran@lemmy.ml 35 points 21 hours ago* (last edited 21 hours ago)
[-] BallShapedMan@lemmy.world 15 points 20 hours ago

Oh that's good to know, I used to do math and then realized I'm probably being an asshole and stopped.

MATH RETURNS BABY!

[-] Lighttrails@sh.itjust.works 17 points 20 hours ago

Remember math? It’s back, in pog form!

[-] BallShapedMan@lemmy.world 5 points 20 hours ago

Oh I remember pogs. My brother's we're huge into them. I was just a bit too old for that fad to hit me. I was a Garbage Pail kid!

[-] Kolanaki@pawb.social 1 points 9 hours ago

Phones have calculators.

[-] LastYearsIrritant@sopuli.xyz 20 points 20 hours ago

FYI, most places will just use the total if there's anything wrong with your math (assuming it's at least what you owe) so this is perfectly valid.

[-] agamemnonymous@sh.itjust.works 1 points 11 hours ago

Weird, the restaurant I worked at always went with the tip line if there was any discrepancy.

[-] Brokkr@lemmy.world 5 points 20 hours ago

The addition is the hard part though, calculating the tip amount is easy. Can you write in just the tip amount and let them figure it out at the POS?

[-] PenguinMage@lemmy.world 1 points 13 hours ago

Every system I've used and currently use you enter the tip amount, so writing how much you want to tip is actually fine. Though I'll usually ask for you to write in the total or ask if it's fine if I do. Technically the cc company cares about that line in case of disputes.

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[-] tdawg@lemmy.world 5 points 15 hours ago

Idk why people don't just give whole number tips. It's so much easier to just add $5 to something

[-] titanicx@lemmy.zip 7 points 14 hours ago

Because it's easier to have a flat 50 out then 47.15.

[-] tdawg@lemmy.world 4 points 13 hours ago

Didn't realize my grandfather was alive and we're still balancing checkbooks by hand

[-] jagungal@aussie.zone 8 points 12 hours ago
[-] ayyy@sh.itjust.works 3 points 8 hours ago

Then you wouldn’t need to fill out a receipt like this.

[-] Diurnambule@jlai.lu 1 points 9 hours ago

Sacré bleu You mean they stopped producing do 6buck coin ? /j

[-] rockSlayer@lemmy.blahaj.zone 7 points 20 hours ago* (last edited 20 hours ago)

$7.83

My method:

  • 42.17 + 8.00 = 50.17
  • 8 - 1 = 7
  • 0.17 - 0.02 = 0.15
  • 0.85 + 0.15 = 1.00
  • 0.85 - 0.02 = 0.83
[-] lung@lemmy.world 8 points 16 hours ago

Jesus brother, what the hell

[-] rockSlayer@lemmy.blahaj.zone 2 points 16 hours ago* (last edited 16 hours ago)

What's the problem with this method? I figure out tips through mental math, without any paper. This is just explaining how I do that mental math

[-] lung@lemmy.world 1 points 12 hours ago* (last edited 12 hours ago)

Yeah you did it in the hardest way possible hahaha

Just subtract 17 from 100 to get the cents. 83. There, done. Or at least 100 - 10 - 7

[-] rockSlayer@lemmy.blahaj.zone 3 points 12 hours ago

I can't do mental math that easily. I struggle with visualizing it, I think better in multiples of 5, and subtraction is more intuitive to me

[-] SatansMaggotyCumFart@piefed.world 16 points 19 hours ago

Three cents to $42.20

Eighty cents to $43.00

Seven dollars to $50

Seven eighty-three!

[-] farmgineer@nord.pub 2 points 16 hours ago* (last edited 16 hours ago)

Mine:

  • ends in not 00, so add whatever makes the ones digit a 9 (7 in this case).
  • make the cents even -> .20 (add .03)
  • go to 100 (add .80)

I think, anyway. I can mostly just look at it and know.

[-] Imgonnatrythis@sh.itjust.works 2 points 16 hours ago
[-] rockSlayer@lemmy.blahaj.zone 2 points 16 hours ago

This is how I do mental math. Figuring out (100-15)-2 is a lot easier than 100-17

[-] Imgonnatrythis@sh.itjust.works 2 points 16 hours ago

For me 100-20+3 is easier, but yeah

[-] nialv7@lemmy.world 3 points 19 hours ago
[-] rockSlayer@lemmy.blahaj.zone 5 points 19 hours ago

I used to do calculators for tips, but noticed my mental acuity slipping. I started calculating tips in my head to keep myself sharp

[-] LovableSidekick@lemmy.world 3 points 19 hours ago* (last edited 19 hours ago)

People always say math when they just mean arithmetic.

[-] jagungal@aussie.zone 3 points 12 hours ago

For the general public that's a distinction without a difference

[-] agamemnonymous@sh.itjust.works 1 points 10 hours ago

Yeah but for those of us who actually studied math, it's silly. Rote arithmetic barely qualifies, you hardly even see actual numbers in math except for a handful of single digit integers for exponents, subscripts, coefficients, etc.

It's like calling a golf cart a "sports car".

[-] LovableSidekick@lemmy.world 1 points 11 hours ago* (last edited 11 hours ago)
[-] Imgonnatrythis@sh.itjust.works 6 points 16 hours ago
[-] Noam_Calhoun@lemmy.today 1 points 14 hours ago

Found the Brit.

[-] usualsuspect191@lemmy.ca 1 points 16 hours ago

I say arithmetics

[-] sundray@lemmus.org 2 points 18 hours ago

Perhaps they expected the server to use geometry to come up with the answer...

[-] probable_possum@leminal.space 2 points 20 hours ago

ω?

I know that constant. It has something to do with imaginary numbers if I remember correctly. Right?

[-] chonglibloodsport@lemmy.world 2 points 12 hours ago* (last edited 12 hours ago)

Not that one, this ω.

Since ω > n for all natural numbers n, it’s clear that 50^ω is a very big number indeed!

[-] lung@lemmy.world 5 points 16 hours ago

the nerdiest possible interpretation of a scribbled 00

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this post was submitted on 25 Jun 2026
286 points (97.7% liked)

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