Name: Primes on the Moon (Lunar Arithmetic) - Numberphile
Uploaded: 2020-03-27T18:15:24.000Z
Duration: 12 min 58 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

Past simple

This started on my friend Mark LeBrun, who lives in California.

To-infinitive

He likes to consider unusual ways of doing arithmetic.

You know that in school, Children have a lot of trouble when they learn arithmetic.

Well, this there's all this trouble with the carries.

So he said, Let's let's make it simple for the kiddies.

We're going to change the rules Now when you add two digits to numbers like seven and eight, the result is not 15 and you're on the moon.

So three times eight is 33 times eight is 33 plus eight is eight.

I hope they didn't actually use this on the moon.

I'm a bit worried about what's gonna happen here.

For example, Suppose we wanted to add, say, 58 19.

What you do is you say eight plus nine is let me take the bigger of the two.

You take the bigger to bigger of one and five is five.

Multiply, say 17 by 24 Remember, digit my digit.

The smaller four ones are one and now 272 sevens are 22 ones are one and now we add them up.

11 plus two is to you pick the bigger of the two and you bring down the four.

So 17 times 24 is equal to 124 on the moon.

So now you can do a lot of arithmetic in Luna.

Respond Take and you can produce not an interesting number Sequences writer Neal, We're reading your loud and clear from pictures on the contingency sample.

L s s time expended now beautiful view in that magnificent desolation.

Funeral arithmetic Once one times one is 12 times tooth is equal to pick the smaller it's 23 times 33 squared is 36 square 67 square.

You pick the smaller zero times one 012001 times one is one.

The bigger is it when we get 100 just like back on us.

Well, we have to do it 11 times 11 We get 1111 atom up 11 plus one is 12 11 squared is 11 100 left, 12 squared two times two is is to two times one is 11 times two is 11 times one is one.

Always speak the smaller and we have them up.

So 12 squared is 112 on so on 19 squared is 119 and so on.

We'd like you to aim a little bit corner right over.

If you were interested in a formal details.

This is an associative community of distributive law.

What I would like to tell you about next of the lunar primes.

Will we have to decide what it means for number to be a prime?

Now, you remember back on Earth seven was a prime because you couldn't ride seven as two times three or anything except one time seven.

If the only way to fact arise, it is as one times itself.

Well, notice seven is equal to eight times seven, right, Because eight times seven you pick the smaller of the two, which is 7 to 7 or eight times seven.

So seven is not a prime because it has a factory ization.

But really, before we get down to the details of this, we have to decide what precisely it means to be a prime.

If the only factory ization is one times itself, what does one mean on the moon?

Well, what is 11 has the property that if you want to play anything, buy one.

One times three is 31 times 111 is 111 on the moon.

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Primes on the Moon (Lunar Arithmetic) - Numberphile

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