Again, NOT mental calculations/mental arithmetic; There's plenty of information about that online.
Larger numbers tend to have progressively longer names (one, two, three vs. seventy-one, seventy-two, seventy-three) which means the speed I can count things at slows down by orders of magnitude after "ten".
The best solutions I can think of would be to keep multiple running tallies (so seven-one two three four five six seven eight nine ten-eight-one two three etc.) or to visualize the number in my head (like a pseudo mind palace I suppose) but I figured since counting has been around for so long someone surely would have come up with something more clever by now.
I would be willing to learn a different digit set or even a different base toward this end.
My MCAT is on Friday. Holy shit.
Anyways, I have equations memorized and focus a lot on C/P since its my weakness. I feel great about B/B and CARs but my C/P section is always so much lower. I struggle so so bad with calculations. I could know the concept well, the formula, the conversion units, and what the question is asking for but by the time I have to divide decimals, do square roots, divide a small number by a big number (anything math related), I get the question wrong. Some questions I can get away with rounding or estimating. Sometimes I can work backwards and come to an answer thats kiiiind of like the right answer, but its never consistent. I have watched youtube videos made for 8th graders because I struggle with not having a calculator! I literally made A's in Physics only because I had a calculator. Does anyone else have this problem with mental math?? if its just me then maybe im going crazy
On Sunday, 32 of the top mental calculators in the world were competing at mental math—many from India but also from Bulgaria, Germany, Spain and the UK.
I was commissioned to write the questions for the competition, and I've also released a video with a spare set of questions so that you can try out the competition for yourself, see what sorts of questions they are answering, and compare your scores to the winners.
No worries if it is very hard—everyone competing will have studied the best methods for calculating e.g. cube roots, divisions and calendar dates etc., and these are also methods that anyone could learn.
Results + Interactive Example Video
A Grand final with the top 4 competitors will take place on Monday 30th August.
I am rather new to crypto, but have some thoughts. Two days ago, I sold 4 shares of a stock for proceeds of 320 dollars. Because of T+2 settlement, the funds settled today. I then proceeded to transfer the funds from the brokerage to my bank account. That will take another 4 days to complete. It will take a total of 6 days to accomplish what takes less than 5 seconds to accomplish with Algorand. Adoption of blockchain is inevitable, I think, as Algorand is more than 100,000 times faster than traditional banking, ie, there are ~90,000 seconds in a day. In 6 days, there are 540,000 seconds, the time it takes to complete the transactions described above, that with Algorand takes less than 5 seconds...
I’ve been thinking about this all day today after a saw something about it.
Maybe Misaki could do with mental out she seems like the most probable option due to her power being able to affect brains. There could also be other options like Mikoto from potentially manipulating electrical impulses, Accelerator doing something similar, even Kakine now that he’s turned Dark Matter into the ultimate creation tool.
Multiplying and dividing by 10 or 2 is much easier on your mind, making the calculation very simple, divided in just 2 steps.
Simple example: 70 / 5 = (70 / 10) * 2 = 7 * 2 = 14
Example with a big number: 7580 * 5 = (7580 * 10) / 2 = 75800 / 2 = 37900
There are a lot of tricks when mentally calculating with other numbers too! Write the ones you know in the comments and I could summarize many in a post for everybody to know! :)
I find that when I don’t practice it for a while it becomes harder to do these... any heuristic or tricks when evaluating bets in-game to get a rough idea of pot odds/equity required to call?
I recently created a mental calculation test to study it with Rasch analysis. You'll have 20 minutes to complete 65 items of widely varying difficulty. Message me if you're interested in taking it.
I would like to share a rule that an old plant supervisor told me and I've found very useful over the years to make quick, on the fly (middle of a meeting) estimation. I have not seen it written anywhere.
The liters per meter of a pipe is the diameter (in inches) squared divided by 2.
It comes very close (about 1% of the actual unit conversion)
Example below:
https://preview.redd.it/udre1mv0vzi51.png?width=543&format=png&auto=webp&s=31de550bc105ad5f7aa7163889e1f9ca5f1368e8
So, if someone ask you about the size of a piping to move 150 m3/h of water. Then you go:
- 150 m3/h is about 42 liters per second (40 is 144, 50 is 180)
- 3 meters per second: is 42/3 = 14 liters per meter.
- 14 x 2 = 28
- Square Root of 28 = more than 5 less than 6. A 6" pipe is your answer.
Adding, subtracting, multiplying, and dividing. In your head.
Basically, if you have to do a quick math calculation in your head, do you often try to confirm your answer with a calculator just in case? Also, are you introverted or extroverted?
This poll is to see if there's any relation between the two things.
I'm mostly wondering if my code is "clean" enough and what pracises I could do better for next time! The program prompts questions and outputs the time it took to answer after every question. It outputs the total time if all questions are correct at the end. I also tried to practice git and uploaded my script to Github. Feedback on commit messages is also appreciated!
import time
import random
# Imports my list of problems in the format of [["Math problem in str form", Answer in int form], ["Math problem in str form", Answer in int form]]
import math_problems
# Changes the order of the questions. Helps with learning
random.shuffle(math_problems.questions)
def mentalcalc(question, correct):
start = time.time()
answer = eval(input(question))
end = time.time()
answer_time = end-start
if answer == correct:
return answer_time
else:
return 0
total_solve_time = 0
for question in math_problems.questions:
solve_time = mentalcalc(question[0], question[1])
if solve_time == 0:
print("Wrong. Start over.")
# Brings it back to 0 so I can make this the condition for faliure in the last if
total_solve_time = 0
break
else:
total_solve_time += solve_time
print(str(total_solve_time) + " seconds of solve time")
if total_solve_time:
print("\nTotal time: " + str(total_solve_time))It's mentioned in the wiki and numerous times that mental processing power is required for some esper powers to function, the biggest example being Accelerator whose power is limited due to a drop in his prowess at mental calculations.
Similarly, all the level 5 characters are demonstrated to be incredibly smart individuals, eg some are in prestigious schools or have subverted knowledgeable professors of Academy city.
So what I'm wondering is how much of this piece of information factors into an esper's powers and potential? Eg: Uiharu is undeniably smart for her hacking/programming prowess. Enough that, personally, I think shouldn't it have helped raise her power's level? Is this elaborated on somewhere in the novels?
Frustration as you are directed to a holding area to wait for a Filet as ten cars are served without a hitch behind you.
Here's a great article on how to be better at mental arithmetic. Doesn't seem so hard after learning those techniques.
For example, my brain feels "lazy" and often doesn't want to do things like this:
- Planning a big project with lots of variables at work
- Writing an email where I have to carefully consider my wording
- Fully considering all the moves in a complex situation while playing a strategy game
My field is computer science, and my aversion to mentally draining tasks is holding me back. Suggestions?
Please comment other such small phone habits that are mildly inconvenient initially, but helpful in the long run.
Can you imagine a writing medium (e.g. a whiteboard or piece of paper) and use it to do calculations, or to solve a problem? And once you have written on it, can you rapidly scroll trough the various steps?
I am asking this because it is known that Nikola Tesla could perform such tasks (even complex analysis problems) in his mind imagining a chalkboard, and he could do it with the same level of accuracy than on a physical medium, but faster.
So I wanted to know, is any of you able to do such things conveniently (speed comparable to doing it on paper)? And if so, can you see the whole page at once, or can you only focus on a small zone of the medium?
A memory that haunts me sometimes...have a laugh.
Me: eats a little more than abuser (I worked out and actually had a little muscle tone I was trying to keep, but didnt really work as my abuser just had to fucking ruin the one good thing in my life too.
Abuser: YOU ARE WASTING FOOD THE STARVING CHILDREN IN AFRICA COULD EAT YOU ARE SO SELFISH AND UNGRATEFUL YOU ARE WASTING MONEY YOURE SO STUPID AND FAT, you're only in NEED of half a piece of chicken. You dont get your filthy hands on more! You're not allowed. I SURVIVE with less that you. So can you! You're just eating more because you are selfish and ungrateful. We FEED YOU!!!
Me: thinks: wait a second...I'm 17. I'm their child. Lol. It's what parents do. Feeding a child is not a favor.
Oh don't even get me started on the yelling and threats that ensued.
https://www.reddit.com/r/LifeProTips/comments/l650ui/lpt_when_doing_mental_calculations_if_you_are/
