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Editado por OsloObliterator:
4/28/2021 3:12:59 PM
7
A cool little math trick
I learned this from one of Vsauce's videos
Think of any two digit number. Add the digits and subtract the sum from the original number. If you rinse and repeat, you will [b]always[/b] end up with 9.
[spoiler]Also I have a question for you older folks. Am I annoying, like do I post too much? Maybe it's me being self conscious but I honestly can't tell[/spoiler]
English
#Offtopic
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6 Respuestas1+1=2 2-1=1 1+1=2 2-1=1 This shows that it doesn’t work with two ones. Unless I understood it incorrectly. [spoiler]nibbles crayon[/spoiler]
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2 Respuestasok i just tried solving this with an equation and its too complicated for me cool shit though
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2 RespuestasAnother fun one to easily calculate percentages in your head. If you have a more difficult one, let’s say 16% of 25. Just swap the numbers around. 25% of 16 = 4 is easier to do in your head. This works for any % ratio.
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4 RespuestasI ended up with three. Is something wrong with 47?
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Editado por pValue2010: 4/29/2021 10:46:36 AMThe second digit of the two digit number is irrelevant as it immediately cancels out during the subtraction. So then you’re essentially just subtracting the number of “10’s” from the number (again, second digit is irrelevant) which makes it divisible by 9. (I.e. 10-1, 20-2, 30-3, etc). I’m ashamed it took me a minute or so to wrap my head around that
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No, you’re not annoying imo. I like expanding my knowledge with math [spoiler]Hecking Spitfires[/spoiler]
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25 RespuestasThis true of any number system. You'll always end up with the highest single digit value. Binary → 1 Base 5 → 4 Octal → 7 Hex → F
