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Magic Square Party Trick - Numberphile

7961 ratings | 338801 views
Matt Parker shows off his Magic Square party trick (unlike magicians, mathematicians often reveal their secrets). More links & stuff in full description below ↓↓↓ More Magic Square videos: http://bit.ly/MagicSquareVideos Rubik's Cube videos: http://bit.ly/rubiksvids More Matt on Numberphile: http://bit.ly/Matt_Videos A little extra bit for this video: https://youtu.be/zhB2AUNcsx0 Parker Square: https://youtu.be/aOT_bG-vWyg Parker Square T-Shirt: http://bit.ly/ParkerSquareTshirt Support us on Patreon: http://www.patreon.com/numberphile NUMBERPHILE Website: http://www.numberphile.com/ Numberphile on Facebook: http://www.facebook.com/numberphile Numberphile tweets: https://twitter.com/numberphile Subscribe: http://bit.ly/Numberphile_Sub Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): http://bit.ly/MSRINumberphile Videos by Brady Haran Brady's videos subreddit: http://www.reddit.com/r/BradyHaran/ Brady's latest videos across all channels: http://www.bradyharanblog.com/ Sign up for (occasional) emails: http://eepurl.com/YdjL9 Numberphile T-Shirts: https://teespring.com/stores/numberphile Other merchandise: https://store.dftba.com/collections/numberphile
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Text Comments (342)
Aemun Syed (7 days ago)
Did You Notice All The Ones Add Up To Six And Six Times Seven Is 42
C HT (1 month ago)
You can try 34 and you will find it more amazing.
Steven Purwadi (1 month ago)
Although this method is an awesome trick to show your friends, it has 1 flaw. What happens when the number you are given is the same as another number after you subtract it? Do you tell them to say a different number?
JustWatchingVideo56 (3 months ago)
Not all the 2x2's add up to the number.
Grisile HNNW (4 months ago)
Parker square of a video
Hi! 35 not
George Alexander (8 months ago)
I was stuck on some homework and this helped alot
Sam Mohanty (8 months ago)
The guy is pausing the vid to get the answers
TheProtean Girl (9 months ago)
This was my favorite trick when i was younger i was always curious about it seeing as i loved math
Faisal Subarank (9 months ago)
Suraj Kumar (1 year ago)
13 box fill only odd numbers and gets answer 42 how get
WhatforNameIsThat (1 year ago)
This is my favourite membership video. So funny to see Matt dig his own hole
ACHARYA ACADEMY (1 year ago)
This magic square method was invented by the greatest MATHEMATICIAN OF ALL TIME SRINIVASA RAMANUJAN
Matt P. (1 year ago)
There wasn't a Parker Square, but there was a Parker 3.
federico saviano (1 year ago)
Parker’s square
MeeMdic (1 year ago)
Parker Square-ish when he explains it
The Atomic Cherry (1 year ago)
That’s not a parker square, but that is a parker 3.
Luke C (1 year ago)
What about the squares at the sides? i.e. 11+8+5+10=34 in the 42 square, do those not count?
Irakly Gagua (1 year ago)
A magic square should contain distinct numbers, so n should be >= 34.
Joseph Romanic (1 year ago)
Is this going to be another Parker square
hector chumpitaz (1 year ago)
Well, I use my personal method called par position that combines position of a number assigned to a letter, which I call 1432 A 1 2 3 4 B 5 6 7 8 C 9 10 11 12 D 24 25 26 27 Using my position algorithm I get 1 8 11 25 26 10 5 4 6 3 27 9 12 24 2 7
TheSuomi (1 year ago)
Is that a Parker Square?
a retard (1 year ago)
Before I start watching, is it another parker square?
Joshua Doll (1 year ago)
One thing I find interesting is that when he shows the magic square in the graphic, the 4 square that is one row above the center and the one below the center add up to the number (I'll say 42) but the 4 square that is one column left of the center and one right of the center does not. Would be interesting to see if it is possible to make it so that those would add to 42 as well.
Ryan S (1 year ago)
But the mid-left and mid-right boxes don't work!! You can't just do some boxes but not all
BlueCassio (1 year ago)
Number sudoku
Shamil Ahimad (1 year ago)
And bad😵💩
Shamil Ahimad (1 year ago)
You are crazy
друг dealer (1 year ago)
I don't think he's qualified to talk about magic squares.
sean keogh (1 year ago)
34 is the perfect number to do this with, because you'll have the numbers 1-16 in a 4×4 grid, and, you can write them in order in a seemingly random sequence. I tried it. It looks more impressive.
The American Fox (1 year ago)
well 11 + 8 + 5 + 10 does not equal 42 it equals 34
Azrael Pagdonzolan (1 year ago)
How does exactly a Parker Square work?
Buster McMuffin (1 year ago)
But if the trick fails, then it will be a Parker Square of a trick.
Timofei Gerasimov (1 year ago)
I saw a magician once combine this trick with another trick to create a magic square of a number that an audience member secretly thought up.
Malvakai P (1 year ago)
is there a Nerd's Magic Square tshirt?
mrmimeisfunny (1 year ago)
Ahh, When we used to trust Matt Parker with Magic Squares. What Nostalgia.
Marowak City (2 years ago)
calling someone a nerd on a numberphile video is not an insult, but a compliment
aman makhija (2 years ago)
Anna Reynolds (2 years ago)
"Wow, I just turned 21! Now I'm finally old enough to.... have a magic square built around my age. Yep."
Red Raven (2 years ago)
How to get beat up at parties trick
adimoon9 (2 years ago)
Classic Parker Square!
SourceOfBeing (2 years ago)
Is there a video proving 1+1=2?
dovis93 (2 years ago)
497 500 506 490 1993-borns like 505 491 496 501 492 508 498 495 499 494 493 507
zqlimy (2 years ago)
Watching this exactly one year later! :D
Brian C (2 years ago)
I was more impressed with the Parker Square.
Kealan Frost (2 years ago)
Jai Carlson (2 years ago)
Delve (2 years ago)
I have just two words this video… Read More
Mileyard Gigahertz (2 years ago)
That 3 was a Parker Square of a 3
Laura Rocha (2 years ago)
But with 32, 33 and 34 numbers repeat themselves, right?
Irakly Gagua (1 year ago)
With n <=33. If n >= 34 there is no repeat.
htmlguy88 (2 years ago)
sadly this only works without repeats above 21+12 =33 otherwise two entries are the same.
Clay & Carlos A. (2 years ago)
42 equals 42.0 !!!!!!!!!420 IS REAL !!!!!!!!!
Ani's (2 years ago)
the first one was an indian magic square
fould13 (2 years ago)
all the numbers add to a billion, and you said a million... bit of a parker square
Liou (2 years ago)
But I'm 19... Does that mean I can't come to matt's parties ? :(
Herr Grasgrün (2 years ago)
Can just put 2s all over the place in case of 8
Static Gridlock (2 years ago)
just watched one of your shows in Leicester and just wanted to know, do you even lift bro?
MrCorvusC (2 years ago)
His reaction to a 42 being a number of choice is priceless :)
Azo Az (3 years ago)
Please arabic😢.
Bengt Bengt (3 years ago)
If the magic number would be a millon it would definitely be a parker square
Almog Levin (3 years ago)
Actually ages don't "tend to be" around thirties and forties! Come on.
PensDominoes (3 years ago)
I think the number at 3:33 on top was supposed to be 1,000,000,000.
Seven09 (3 years ago)
The answer to life the universe and everything is 42
CasperTheMeanieGhost (3 years ago)
The answer to life the universe and everything is 3, 6 and 9 (the first 3 multiples of 3).
Raffl (3 years ago)
Well that's a bit of a Parker square...
DaBoff99 (3 years ago)
I'm going to print off that n Magic square and memorise it, thanks Matt Parker!
MrQwefty (3 years ago)
What about this? 3 7 3 3 3 3 7 3 7 3 3 3 3 3 3 7
Kiełbasiarz (3 years ago)
There's a youtuber called 42 ;)
Tony Kravitz (3 years ago)
So this is the actual complete answer for life, the universe, and everything: 22-01-12-07 11-08-21-02 05-10-03-24 04-23-06-09
matt math (3 years ago)
I love that every comment is about the Parker Square.
matt math (3 years ago)
classic parker square
challengedcomforted (3 years ago)
rubber chicken (3 years ago)
I always watch Matt Parker in 0.5 speed. It's hilarious.
NoriMori (3 years ago)
Remind me to try this sometime.
exotictoad (3 years ago)
i was expecting a parker square in this video.
Gamer_X (3 years ago)
i have question about number 3. if i take number, that can be divided by 3 and sum up its digits, it will give me number that can be divided by 3. why is that?
Dan Dart (3 years ago)
"look at him think!" xD can you see Brady's mind cogs, Matt?
Jaime Fernández (3 years ago)
Could you do a video about algebra (zheng/fu/wu and fang cheng) and magic squares in china? its very interesting
TEEMODO (3 years ago)
at 0:09 it sounded like he said "potty tricks" instead of "party tricks" LOL
HAC AgarClan (3 years ago)
Make a video on the function of a rubber duck!!!
programmer37 (3 years ago)
is there an easy way to regognize these numbers ?
kwelchans (3 years ago)
How did you know I was 42?
Skye Galicia (3 years ago)
If ever this question has been answered pls. comment. okay heres the question: what is the sum of ...(-3)+(-2)+(-1)+0+1+2+3...?
Skye Galicia (3 years ago)
also the reverse of it
Owen Prescott (3 years ago)
and so the ParkerSquarepocalypse begins...
Param Rajguru (3 years ago)
it's epic
Jake Lipe (3 years ago)
That was a Parker Square of an attempt at making me believe there wasn't a trick behind that.
Dimitar Nikolovski (3 years ago)
the 4 corner numbers also add up to the chosen number
Dimitar Nikolovski (3 years ago)
the four corner numbers also add up to whatever the number is
Dimitar Nikolovski (3 years ago)
the four corner numbers also add up to whatever the number is
Richard Swanson (3 years ago)
I have one of these squares that Matt made and signed for the number 32, from his show stand up maths at the Edinburgh fringe last year :-D
Basil Dwight (3 years ago)
This can add a very neat twist to any one of the classic mathemagic (or other) mindreading tricks.
Ou Ningxiang (3 years ago)
Can you guys do a video of the graphic function y=x^x?
Mak X (3 years ago)
#python, just could not resist :p n = 42 count = 0 square = [[0, 1, 12, 7], [11, 8, 0, 2], [5, 10, 3, 0], [4, 0, 6, 9]] offsets = [(0, 20), (2, 21), (3, 18), (1, 19)] for offset in offsets: square[count][offset[0]] = n - offset[1] count += 1 for List in square: print List
DHK Cuber (3 years ago)
0:25 42 42 Thoughty2
Some Random Fellow (3 years ago)
Here's a thought: Along with uploading these, you could upload another video of the complete, unedited interview (unlisted of course) for the hardcore numberphile fans like myself
martinshoosterman (3 years ago)
I guess if someone happens to be 20 then you've really gotten yourselves into a parker square
Some Random Fellow (3 years ago)
+martinshoosterman HA! GAT EEM!
Siddharth Dandavate (3 years ago)
At 2:10, wouldn't it be even better to say that those are multiples of 18? That way they would be consecutive multiples (18*1, 18*2, 18*3, 18*4).
I tried this and messed up. Result was a parker square.
Mo S. (3 years ago)
I was just about to memorize all these numbers for party reasons, but stopped after 3. I guess that was a parker-square of an attempt.
VeniVidiVelcro (3 years ago)
So...what about a magic cube?
Colonel Dookie (3 years ago)
But wait...the first square has 11, 8, 10, and 5. Those add up to 44, not 42. Same with 21, 2, 24, 3 (makes 50, not 42). You add every other column, row, diagonal, and 2x2 square but those two. Why the fail there?
Some Random Fellow (3 years ago)
+Colonel Dookie must be a parker square
Andrei Constantinescu (3 years ago)
Give me a number ! Ok , Thoughty2 .
Bacon (2 years ago)
NoriMori (3 years ago)
+Andrei Constantinescu Wut?

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