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this post was submitted on 26 May 2026
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Microblog Memes
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I don't pretend anymore, I just calculate on a computer or phone.
Once my friend with a PhD in Mathematics calculated the wrong tip in his head.
I don't trust anyone to be able to do math in their head, especially not myself.
Indeed i trust people who work with high level maths even less for mental math than, say, someone who works as Front of House or a Barista.
The study of mathematics requires surprisingly little arithmetic.
Similarly, don’t expect much help with history questions in pub quiz from someone with a history degree.
“You have a whole ass degree, why can’t you tell me when Garfield was president!!?!?!??”
“It’s not like that … my thesis was on medieval crop rotation “
I have a friend who has a PhD in medieval Malian history and he trounced me in french history trivial pursuit 😭
It is only surprising if you think mathematics is more or less equivalent to arithmetic.
I was "bad at math" all the way through school and it wasn't until I realised how wrong this is that it finally clicked. I still cannot calculate shit unless I have pen and paper but I usually have access to this when solving integrals. I went into a math heavy program at uni without any issue.
I remember reading a while ago that it is actually a problem in education that the only ones who pursue math degrees ate those who could easily grasp the arithmetic heavy parts of math, resulting in a narrow presentation of what math really is throughout school.
I'm about to get a PhD in math, and I am not the best at mental arithmetic either. I used to be really bad, but teaching has forced me to improve by a lot. It was very annoying for me to go back and forth between my notes/computer and the blackboard whenever there was a big multiplication, so I just slowly got better at doing it in my head. Also, it had the added benefit of letting me improvise more.
My college roommate got insanely good at it when he set an alarm on his phone that required him to do some calculation before he could turn it off. After about one semester, he was doing those half asleep lol. I think he finally decided on an alarm that would need him to walk outside and scan a QR code to turn off.
Another method to get good at mental arithmetic: At the supermarket checkout, pay in cash—and do your best to minimize the number of coins you end up with. Start calculating right after you've put your groceries on the checkout conveyor belt: Pour all your coins in your hand and then calculate in advance which coin combination you would give for which grand total that might result (or just for the decimal places thereof).
Arithmetic is useful, but they should teach it through Slay the Spire or something.
Keep math class for the fun stuff.
Judging by how many people say I should calculate restaurant bills it must be pretty surprising... I always relate the scenes of my PhD supervisor trying to split up a bill at a table full of mathematicians :P
I had to learn how to do maths with a computer and work around the limitations of not being able to draw the funky symbols to be able to do it.
I don’t fuck with it when it’s got the symbols though, I let a intern or junior “learn” on that 🫣💀
As someone who studied engineering: I always use a calculator because I learned over those years to NEVER ever trust my mind maths, even for basic stuff like 3x5
I trust my mind math if I need approximate and it's not super important. My brain is really good at back of napkin math but if I needed the actual answer or otherwise need precision, I'm pulling the calculator out. If I want to know where a falling object is roughly going to land, I'm good but if I need to know how much wood I need for a project, I should do the work of making the drawing and manually add it all up with the calculator
Take the tax and double it. That's close to 20%. I use that trick to make sure I'm doing the math correctly.
Tax rates are variable by location and may not be ~10% in some places.
A more accurate way is just to divide the subtotal by ten (move the decimal one place to the left) and double it. This gives you the actual 20% value.
This is the way. Move it one over, multiply by 2, round it up to the nearest whole dollar, done.
it's easier to just not tip