how i do multiplication so fast

how i do multiplication so fast
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math, but FAST!

[Sloimay]

Official lyrics :

[Intro]
I want to show you guys how you can multiply 2 numbers-
I want to show you guys how do mult-
I want to show you guys how you can multiply 2 numbers really really fast
So check this out!

[Bridge]
Let's first do eight hundred eighty two,
And we are going to multiply by twenty four
So, what the answer?
Let's see!

[Chorus]
We will have
Two, one
One, six, eight!
Yes!

[Bridge]
The next example is :
Four hundred ninety seven,
And let's multiply this with
One hundred fifty six! Ok!

[Chorus]
So, the answer should be
Seven, seven!
And then we have
Five, three, two!

[Outro]
df- Again, verify it!
Eh go ahead and work it out the usual way.

Now, I wanted to tell you guys a secret

How I did these two questions so fast.
Ready?

I did 'em earlier;
And then I put down the answers
Over there :D

[Asterism_Desmos]

I thought he was just gonna say that he memorized the 2, but the fact that I couldn’t tell that he was looking over makes me more happy.

[Mangoes]

I want to show you guys how to multiply 2 numbers - I want to show you guys how to multi - i want to show you guys how to multiply 2 numbers really really fast

[fantiscious]

976 x 847

- Split the two numbers into prime factors (this should be very easy):

(2 x 2 x 3 x 3 x 3 x 3 x 3) x (7 x 11 x 11)

- Now shuffle all the factors randomly:

3 x 2 x 7 x 3 x 2 x 11 x 3 x 11 x 3 x 3

- Now work from left to right:

3 x 2 x 7 x 3 x 2 x 11 x 3 x 11 x 3 x 3
6 x 7 x 3 x 2 x 11 x 3 x 11 x 3 x 3
42 x 3 x 2 x 11 x 3 x 11 x 3 x 3
126 x 2 x 11 x 3 x 11 x 3 x 3

- Uhh...

252 x 11 x 3 x 11 x 3 x 3

- Give me a second...

2772 x 3 x 11 x 3 x 3

- Good...

8316 x 11 x 3 x 3

- I give up

[ENTMusic-cjwt]

I am so into your usual way of making videos, and because some computations require some beefy calculation power (like the Lambert W function), I though you'd say "I just plugged it into Wolfram alpha" until I noticed that you could literally use any calculator for this.

[dorian]

Hold on, so you're saying that doing problems in advance... will help me with them in the future? No way.

[nimmira]

the most serious part is, when I was watching the time line and few seconds left and I'm like: what kinda method is this that just needs 2 seconds of explanation!?!?!

[kylenetherwood]

This is how I integrate but instead of me doing it earlier it's a mathemetician who did it 200 years ago

[mathmancalc]

If you haven't seen his performance yet, Art Benjamin can really do it in his head very fast. He came to my university back in 2005 to do a show. I think he's a professor at Harvey Mudd in California. He is very impressive.

[_wetmath_]

its crazy to think that some people can calculate the answer faster than they can write it down

[aronbucca]

I want to ask you a question, because I'm italian and I didn't quite get this well. You are a university teacher, aren't you? So I want to understand if students in your university study only calculus or even other subjects.

[AmanDweeb]

I request youtube to not restrict abusive words for this channel 🙃

[tranmanhuc]

i have learned the (pretty fast) criss-cross method, and still it might not be fast sometimes

[andrel]

What he did not say, is that he computed the sum over there in his mind

[cronosvix]

I thought this sort of thing will be posted in April fools day, but it turns out you made it faster

[the_pks_]

Where can I find his other videos with this talking style 😂

[danishsharma]

I know that because while u solving the question your no of thinking toward is. Lesser than the watching right hand of the board which make sense that you did it earlier

[harish]

Ik he wud say the truth at the end 😂😂🙌

[wuyqrbt]

Let me tell you So Fast:
I love you teacher 💗

[Shadow-fvhp]

I feel scammed, betrayed, and lied to >:(