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B1 Intermédiaire Anglais 9:42 Educational

How big is a billion? - Numberphile

Numberphile · 1,765,060 vues · Ajouté il y a 3 semaines

Statistiques d apprentissage

B1

Niveau CECRL

5/10

Difficulté

Sous-titres (233 segments)

00:00

JAMES GRIME: As an antipathian,

00:02

how big is a billion?

00:03

TONY PADILLA: No, I'm not even going to go there, man.

00:05

JAMES GRIME: Well, what were you taught?

00:06

What were you taught at school?

00:07

TONY PADILLA: OK.

00:07

So there's basically two ways of interpreting

00:11

what a billion is.

00:14

There is the correct English way.

00:16

And there's the incorrect American way.

00:18

I think I was taught a billion is 1,000 million.

00:21

JAMES GRIME: Right, exactly.

00:22

Now, that's what I was taught at school as well.

00:24

Although in Britain the older generation would say a billion

00:29

is not 1,000 million.

00:30

They would say it was a million million.

00:33

TONY PADILLA: There's a beautiful mathematical logic

00:36

to the old way of doing and it, which I just don't see in

00:40

the new way.

00:41

JAMES GRIME: If we ask our viewers, I reckon about half

00:44

of them will answer a billion has nine zeroes.

00:48

That's 1,000 million.

00:49

And I reckon the rest of them will say a billion has 12

00:53

zeroes, which is a million million.

00:56

And it depends on how old you are and where in

00:58

the world you live.

01:02

Let's be honest.

01:03

Real mathematicians and real scientists, if they've got a

01:06

large number, they're not really going to use billions

01:09

and trillions.

01:10

They actually use standard form.

01:12

So if I want to say something with 27 zeroes, you'd write

01:17

something like this.

01:18

You'd be 5 times 10 to the 27th.

01:22

But if you're reading articles in the newspapers, on BBC

01:28

website, they're going to use words like

01:32

billions and trillions.

01:33

Now, there is dispute.

01:35

There are two systems.

01:37

There's the short system and the long system.

01:40

So let's have a look at the short system first.

01:43

So the short system is based on powers of 1,000.

01:48

Let's start off with the number 1.

01:52

Now, it is a power of 1,000.

01:54

It's 1,000 to the power 0, So that's 1.

01:58

What's the next step up?

01:59

Well, you get 1,000, don't you?

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