Hello, everybody!
Today, I'm going to read your mind,
and I'm going to predict a card
by using the power of three.
This is what you're going to do:
You're going to take a pack, and you're going to pick
three cards with values less than ten.
So we're not using tens,
and we're not using picture cards.
But feel free to pick
any three cards
with values less than ten.
You can shuffle the pack
if you want, and leave it to fate,
and see what you get.
Now, we're going to use the power of three
to make more random cards.
You're going to take the value of each card
and you're going to triple it.
So if I triple the first card,
I'm going to get a nine.
I'm going to go through the pack,
and find a nine,
and put it underneath.
The suits aren't important.
Now, if I triple the second card
I'm going to get fifteen.
Well, there's no such thing as the fifteen of diamonds,
or the forty-two of hearts,
so for values greater than ten,
I'm going to have to use two cards to spell out the value.
So, for fifteen,
I'm going to take an ace,
and I'm going to take a five,
to spell out fifteen.
OK, let's do this one more time
with the final card.
Triple it to make six,
and go through the pack
find a six,
and put it underneath.
Take the old cards and put them back in the deck,
because you might need those later.
Take the cards that are on the table,
feel free to shuffle them up, to change the order.
And we're going to do this one more time.
We're going to use the power of three again.
We're going to triple the value
of each card
and we're going to end up with six or more cards.
OK, now it's your turn.
I'm going to close my eyes.
I'm going to turn my back,
and you're going to do it.
So, feel free to pick three cards
from the pack--any three cards you want.
So it might be something like this,
something like this,
and let's leave it to fate.
And we get something like that.
Take each card and triple the value.
So I can't see
what you're doing here,
so I'm going to have to trust that you're doing it right.
But triple the value of each card.
Remember,
if the value is greater than ten,
you're going to have to use two cards
to spell out the value.
And finally--again, I can't see what you're doing--
but, you're going to have to spell out
the final card.
Take the old cards,
and put them back
in the deck.
Take the cards that are left behind
feel free to mix them up if you want to,
and we're going to do this
one more time.
We're going to take the value of each card
and triple it.
Remember, as always,
if the value is greater than ten,
it will take two cards to spell it out.
We're going to take each card
and we're going to triple it,
using the power of three.
So
again, I just have to trust that you're going to do this right.
And this is what we get.
Take the old cards
and put them back
in the deck.
So how many cards did we end up with?
We ended up with seven cards in this case.
Feel free to mix them up, to change the order.
Now, I want you to pick one of the cards,
remember the value,
and turn it over, face-down.
Now I'm going to turn around, I'm going to open my eyes,
and I want you to transmit the value
of your card.
OK, think of your card.
And your card
was
a three.
Now, this works by something called
'casting out nines.'
You will always be able to group
your cards left behind
into groups
that add up
to nine.
So here, I've made three groups
that add up to nine.
So you do this thing called 'casting out nines,'
you get rid of cards
that add up to nine,
and the card that's turned over
will be the missing card
to make the final group
add up to nine.
In this case--there you go--four.
You don't have to start with three cards.
You could start with one card.
The important bit
is you have to triple
twice.
You have to times by three twice over.
That's the important part.
OK, and that's how you do it.
If you have been,
thanks for watching.