How Chinese multiply [Video]

[Dead_Soul]

Code: Select all
what do u think? thought it was pretty interesting.
(sowwie if it's old)

[Miguez]

that's some weird ass shit :O

[evilpeta]

clever

[Amarisa]

jesus now ill use it to impress my math teacher XD or even ace a math test without a calculator! though trig and that might get a little hard without it.

[TOloseGT]

that's not how i multiple...

[-.-]

there is a trick to doing logs base 10 without calculators too, but oyu have to learn log 1 thorugh log 10 for it

[Deadsolid]

http://www10.wolframalpha.com/

[[SD]happynoobing]

same concept as your regular non-calculator multiplication method, just more graphical rather than staring numbers in the face.

[SM-Count]

Crunching numbers isn't math.

[CrimsonNuker]

Im glad I have my mini-calculator with me at all times, I never know when i'll need it. *pushes up glasses*

[Amarisa]

Im glad I have my mini-calculator with me at all times, I never know when i'll need it. *pushes up glasses*

need some pocket protectors?

Crunching numbers isn't math.

yes but it could help when you need to times 2 big numbers ya know

[Thomas42]

Handy stuff, but I'll stick to my calculator. Thanks for sharing.

[Goobronicus]

What happened to

 2754
x 320
  0000
 55080
826200
881280


?????????? I guess I don't see how the other could be easier lol, but I admit, it's interesting.

[CrimsonNuker]

What happened to

2754
x 320
0000
55080
826200
881280


?????????? I guess I don't see how the other could be easier lol, but I admit, it's interesting.

I like the Chinese way better

[Goobronicus]

What happened to

2754
x 320
0000
55080
826200
881280


?????????? I guess I don't see how the other could be easier lol, but I admit, it's interesting.

I like the Chinese way better

You suck! lol

[woutR]

What happened to

2754
x 320
0000
55080
826200
881280


?????????? I guess I don't see how the other could be easier lol, but I admit, it's interesting.

I like the Chinese way better

Damn Winese and Wapanese kids these days.

[[SD]happynoobing]

trying to draw a series of 9 parallel lines in limited space can be quite difficult.

[inky]

Same concept when using your fingers to multiply...only with more "fingers"

[Miguez]

Same concept when using your fingers to multiply...only with more "fingers"

lol who multiplies with fingers?

[LillDev!l]

it becomes less handy if you do stuff like 29x29 though, coz a 9 will cross an other 9.
will be lots off dots to count ( with high numbers overall).

Its still pretty nice though, i showed it to my little sister, shes kind of bad at stuff like this so it might actualy help her a bit

[*BlackFox]

Handy stuff, but I'll stick to my calculator. Thanks for sharing.

+1

[Doron]

god I really suck at math...

cuz I don't understand shit of it even after those two examples...

I'll just use the old method of

1234
5678
_____×
15412

I have no idea if that's correct. look at how my math sucks. it's a miracle I can count to 10.

[PR0METHEUS]

Same concept when using your fingers to multiply...only with more "fingers"

lol who multiplies with fingers?

I don't use any finger tricks myself, but I was taught an interesting one for multiplying by 9 (at least for small numbers). I don't know if this at all relates to the OP in this thread because the video is blocked for me.

Hold up 10 fingers. Mentally number them left-to-right 1-10. Whatever number you're multiplying by 9, lower that finger. The rest of the fingers give you the answer.

Ex: 9x5: Put up 10 fingers, lower your left thumb. You have 4 fingers raised on left hand, 5 on right. 9x5=45.

[SidiousX]

god I really suck at math...

cuz I don't understand shit of it even after those two examples...

I'll just use the old method of

1234
5678
_____×
15412

I have no idea if that's correct. it's a miracle I can count to 10.

[wootpops]

i don't think my girlfriend multiplies like that. she just does it all in her head. she puts me to shame and i use math on a regular basis at work

besides everyone has a cellphone and they prob have a calculator app on them. no one really needs to know math anymore.

[Ryoko]

Wouldnt that suck if it was 189 x 789

[PR0METHEUS]

Wouldnt that suck if it was 189 x 789

189 * 789 = x
(180 + 9) * (780 + 9) = x
3(60 + 3) * 3(260 + 3) = x
3(3(20 + 1)) * 3((65 * 4) + 3) = x
3(3(21)) * 3(((13 * 5) * 4) + 3) = x
3(3(3(7))) * 3((((12 + 1) * 5) * 4) + 3) = x
3(3(3(6 + 1))) * 3(((((3 * 4) + 1) * 5) * 4) + 3) = x
27(6 + 1) * 3((((3 * 4) + 1) * 20) + 3) = x
(162 + 27) * 3(((20(3 * 4) + (1*20))) + 3) = x
189 * 3((20 * 3 * 4) + 20) + 3) = x
189 * 3(240 + 20) + 3) = x
189 * 3(260 + 3) = x
189 * (780 + 9) = x
189 * 789 = x

And OBVIOUSLY 189 * 789 = 149,121. No wonder it takes me so long to do math!

[Doron]

Wouldnt that suck if it was 189 x 789

189 * 789 = x
(180 + 9) * (780 + 9) = x
3(60 + 3) * 3(260 + 3) = x
3(3(20 + 1)) * 3((65 * 4) + 3) = x
3(3(21)) * 3(((13 * 5) * 4) + 3) = x
3(3(3(7))) * 3((((12 + 1) * 5) * 4) + 3) = x
3(3(3(6 + 1))) * 3(((((3 * 4) + 1) * 5) * 4) + 3) = x
27(6 + 1) * 3((((3 * 4) + 1) * 20) + 3) = x
(162 + 27) * 3(((20(3 * 4) + (1*20))) + 3) = x
189 * 3((20 * 3 * 4) + 20) + 3) = x
189 * 3(240 + 20) + 3) = x
189 * 3(260 + 3) = x
189 * (780 + 9) = x
189 * 789 = x

And OBVIOUSLY 189 * 789 = 149,121. No wonder it takes me so long to do math!

say wut??

Srsly, I hate math now even more.

[woutR]

Same concept when using your fingers to multiply...only with more "fingers"

lol who multiplies with fingers?

I don't use any finger tricks myself, but I was taught an interesting one for multiplying by 9 (at least for small numbers). I don't know if this at all relates to the OP in this thread because the video is blocked for me.

Hold up 10 fingers. Mentally number them left-to-right 1-10. Whatever number you're multiplying by 9, lower that finger. The rest of the fingers give you the answer.

Ex: 9x5: Put up 10 fingers, lower your left thumb. You have 4 fingers raised on left hand, 5 on right. 9x5=45.

The trick we were learned was a lot easier. You add one number with 1 and you deduct the other with 1 as well.
18 -> 27
1+1=2
8-1=7

2+1=3
7-1=6

etc etc
Or at least I think it's easier.

A bit OT but is there a word describing these kind of tricks? In Dutch we call them 'Ezelsbruggetjes', literally translated: 'donkey bridges'.

[Goobronicus]

A bit OT but is there a word describing these kind of tricks? In Dutch we call them 'Ezelsbruggetjes', literally translated: 'donkey bridges'.

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