Numbery Card Trick - Numberphile 

Hey guys - do you like card trick videos with a bit of maths? Do you want more? Thumbs up so I know whether to shoot more! - Brady

Lol, it really feels like he doesn't want to reveal his secrets. :P

If they pick an irrational number, punch them and take their money.

Here's my slight variation on this trick: If N1 < N2, put the second "fail" card on the bottom before counting the difference. If N1 > N2, put the whole second pile underneath as Matt did. That way you can be consistent with how you count the cards (always turn over the Nth card, instead of counting N and then turning over the next card).

"and then their brain blows up" 😂😂😂😂

Do more! Maths or Math FTW

we're doing a bunch of Rubik's videos but they are not quite finished yet...

Brady, it looks like people want more MATHS CARD TRICKS :)

great - thank you! more like this one are coming!

I've never seen someone so enthusiastic about magic.

about four years I think (on RU-vid)

In the first attempt, I thought it turned out to be a Parker square trick.

What if they pick a complex number?

"no youtubery"

"Really? Im glad you're certain because it is the top card!" "and then their brain blows up"

What if they say 5 and 10 or any other pair that one is twice the other? Then the difference would be one that they already guessed and the reveal wouldn't work.

I'm really excited about the Rubik's cube videos! I've always been fascinated by those things, and any discussion about them from you guys on Numberphile is guaranteed to be amazing, and probably even mind-blowing.

I like how he was like 'Hey! You're still here! What more do you want?"

1:31 How to fold up a paper *properly* 😆

coming soon!

3:40 😂😂😂 This is meme material!

You should do more videos with Matt. He's pretty cool and funny!

Some of the related videos are pretty cool ;)

Loving the adjective "numbery"

This is a mechanic that can easily be added onto to involve audience members picking the card. Add a little sleight of hand into the equation and you can really make a brain-teasing trick that's guaranteed to baffle people. Not many magicians actually mix sleuth tricks with math tricks, but when it's done well, it's really good.

Nice. Covered all of the possibilities. I like the MIT (Magician In Trouble), syndrome. This effect is a great follow up after an ACAAN (Any Card At Any Number), effect where the effect is carried one step further (if it ever comes up that the spectator is sceptic of the first effect ), by allowing the spectator to pick the number where the card should be in a sense that you sent the number to the spectator, yet leaving the spectator with the thought that the spectator really received the number that you sent or the spectator could have picked any number that popped in their head. This is perfect when the spectator is sceptic that the performer is really not sending the number to them mentally and the spectator just say any number to see if the trick will work. So, when the effect still works, in that case, this makes the effect all the more powerful!

I was actually thinking twelve!!

soon, soon!

AGH I almost thought the video was gonna end at 4:30! Thanx for another awesome video Brady :D and Matt for the cool trick.

I really enjoy your videos!

3:40 LOL

seems that way

the end was amazing

That's the most parker way of folding a paper

i love this channel!

Much simpler, easier and more effective as a trick (IMO of course) - first, tell them to pick a number between 5 and 20 so you're not counting cards all day long. You count down and show whatever number card they said. After you get it wrong, put the cards back on the deck, and then act like you just realized that since THEY came up with the number THEY should do it. Hand them back the deck, they count down the same number, and quicker than you can say Spiriti mei infernali, obedite, it works.

Oh a teaser! I can't wait. Keep up the good work.

That guy's my favorite out of all the guys in numberphile videos. I'll always remember the video where he suggests he is going to start writing on a blackboard and pulls it away to reveal more brown paper.

Yes! love learning magic tricks like this.

Lol the still face at the end of the video is classic

I love his face in the last frame.

Don't do the failing twice thing. Just ask for a number, deal, ask for another number, deal, then show that they found the card. Failing twice makes it looks like you are just going to keep going until you finally reach their card

Great video! Bu I especially love the list of Brady's channels in the description! I've been missing out on a few, but not anymore! How long have you been doing this?

9:37 is a meme waiting to be discovered.

This guy is just amazing.

that was awesome!

this is the sickest trick ever! i've got to use it on my friends that always do card tricks on me!

When he said that we have to write down the top card, I immediately understood the trick. And it is so simple!!!

Brilliant.

I hated math my whole life, I can't stand one day of my life whit out numberphile since I have discovered it. Thank you numberphile for showing me the beauty of math!

More of these kind of videos ! Nce one guys !

Of course I'm still watching!

When a person chooses a smaller number second (e.g., 7 followed by 5) you do not need to change the trick and present the 5 card. Simply ask them to choose the second number, in this case 5 and place the 8th card on top of the pile you just counted out instead of placing in back on the the main card pile. Proceed with placing the "counted" pile underneath the main pile and count out 2 in this example and the 3rd card will be the card you wrote down.

A bunch of them? It seems I have a lot to look forwards to! :D

"And then their brain blows up" glad I watched it to the end

I love this trick!

Hahaha his face at the end:D

I love one of your tricks where the final 3 cards remaining are the spectator's cards.

I did the trick to a friend, his first choice was 1, I showed him the card and he was blown away!!

That end was genius.

Makes searching for Numberphile videos easier.

End then their brain blows up. ie. use on enemies.

I was slightly terrified because Brady said both of the numbers I was thinking of.

my brain when they pick a negative number and insist I count from the bottom

that was the best thing ive ever seen as a comment reply

That's really neat folding

Oh man, I wanna make a computer from playing cards. I don't know how, though.

Interesting video! This is an invitation to see an artist theory on the physics of light and time! This theory is based on just two postulates 1. Is that the quantum wave particle function Ψ or probability function represents the forward passage of time itself 2. Is that Heisenberg’s Uncertainty Principle ∆×∆p×≥h/4π that is formed by the w-function is the same uncertainty we have with any future event within our own ref-frame that we can interact with turning the possible into the actual!

"and then their brain blows up." hahahaha, u r just too funny.

LOL The ending

When asked to pick a number between 1 and 10 or some larger number, I always go with 2π

I'm still watching in 2019

just when he wrote down his prediction the bottom card of my deck showed exactly that card after shuffling it

i laughed at the face at the end XD

Wow, the outro expressions😂

Nice trick! :)

To keep them from selecting the same number twice, after the first number "fails", tell them that number didn't work, so you're sending them a different number.

I always forget how RU-vid comments didn't always have sub-threads for direct replies until I watch videos that are like 6, 7 years or older and see comments [usually from the uploader] that are seemingly nonsensical and talking to nobody, when in reality they are actually in response to another comment and replies just used to be their own comments Really makes me appreciate the current comment system, honestly. But remembering the old system reminded me of the spot above the comments where folks could "submit" [for lack of a better word] a video to be there as a related/response video [I don't remember specifically what the term was, if there's anyone who's as much of a fossil as I am who's actually understanding what I'm talking about, let me know] with the uploader's approval

I had a deck of cards and was doing this with him. I was shuffling the cards as he was explaining what to do if they pick 1 or 0, and i flipped over the top card at the exact same time as he did. It was the 8 of diamonds. My brain blew up.

I found out on the Internet a very complicated math card trick that works every time and I have no idea how it works, it requires no preparation, no peeking at a card, not a single cheat. Can I make a video and reply to this video showing the trick? It's really impressive!

That's the perfect end face

Thanks, I thought it was the end when the Numberphile screen shows up.

Perfect!!

But the fact that you look at all the cards at the start puts the "magic" of this trick way back.

Me too! D: I want to see that video!

i luved the way he folded tht paper xD

RU-vid subtitles had you saying "math card trick". I had to check. Thankfully RU-vid got it wrong.

waiting for it soooo badlyyyy XD (so I can post it on tons of cubing forums :D)

Two things to correct: First - there's 52 factorial ways that a deck can be shuffled. So as opposed to 52 squared, which would be 2704 ways to shuffle a deck, there's actually 80,658,175,170,943,878,571,660,636,856,403,766,975,289,505,440,883,277,824,000,000,000,000 ways a deck of cards can be shuffled. And even with all those ways to shuffle a deck of cards, there's only 52 spots a particular card can go in, so the 8 of diamonds will be in slot 1 (on top) once out of every 52 times.

Yes, from Perth.

7:03 Love that phrase! :D

YES please!

that is an amazing trick. how did you do it. wow

Mind=blown.

great bar trick.

Awesome

Great folding

Oh my, I'm excited. I have a 7x7 cube that is so much fun to solve. I want to get an 11x11 cube but they're very expensive (over $100).

Mann u are genius

He said twelve the same time I did. Sacred the shit out of me.