[Official] Nerdy Math Topic

Share cool math tricks you’ve discovered here. You can also find ways to incorporate them into hs projects. Link those here!
We might also have weekly or bimonthly challenges where you have to solve a math problem and then incorporate that into a hs project.

But anyway, have fun math-ing :slight_smile:

(This is basically a newer, more hs related, official official version of the numberphile topic)

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If you take one number then multiply it by ten, you get another number that is exactly ten times the value of the first one.

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Yay! I’m glad I decided to ask Fea to bring this back!

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Coolio topic m8

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cool!

There’s this integers trick thingy with a tic tac toe board,

image
And it shows that a negative + a positive = a negative, positive + negative = negative, etc.

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You mean times, not + lol

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Did you know? (you probably did)

9 x 5 = 45
4 + 5 = 9

This is true for every multiple of 9 up to 9(9)

Did you know it?

  • Yes
  • No
  • I am Petrichor

0 voters

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Awesome topic, @FearlessPhoenix!

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Hhey! My new favorite math topic
I was doing some interesting math stuff today in swift I’ll probably put it on, a new puzzle I invented

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In a 3x4 grid, try to fit in as many digits of pi as you can

For example I could do:

3141
6295
5358

And get 13 digits. Start at the 3, and you can move in any of the 8 directions (up down left right and diagnals), which gets you to: 3141592653589
(You can reuse boxes, that’s how I got the 9 at the end)

The problem is, how many digits can you fit in the 3x4? It turns out to be quite a bit!
I proved and found the maximum, maybe I’ll post it later. It’s really interesting (There is only 1 maximum actually, no ties)


Tougher challenge:
Find the maximum digits you can fit in a 3x5 and a 4x4

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Googolplex = 10,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000

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Easy way to make a bunch of small numbers out of a big one
Say you have the numbers
18
49
90
72
19
Squish them all together to make
1849907219
To take them apart you would do
1849907219%100=19
That’s your first number
Then do
1849907219-19=1849907200
Then
1849907200/100=18499072
Repeat that until you have all the numbers.
Easy save code! (If you of course encrypt/decrypt)

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they teach that in school now i think lol

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Wow I didn’t know that lol

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uh… 1 + 1 = window.

does that count?

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incredible. i am amazed by your vast intelligence. i, too, have something to offer.
2 + 2 does not, in fact, equal 4.
please bow down to me, humans.

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bows

Yes Ma’am!

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Nice facts y’all

Now can I challenge y’all to code a proof for some of your facts?
(Ik the proof lol and it’s pretty straightforward for all of em but coding it doesn’t hurt :wink: )

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So it’s going to be easy? I thought it will be a challenge?

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Hmm?

No I meant coding the proofs even though you know them doesn’t hurt.
Like code a project explaining the proof for the cool math fact you posted.

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