7x7 = 49

You have to add a ZERO after the total of fingers below and including the index fingers (2 index fingers and 2 thumbs = 4) to give a value of 40

Three fingers on each hand above the the joined index fingers 3x3 = 9

40 + 9 = 49 = 7x7

3 fingers

Russian multiplication

This is an old russian system for multiplying ANY numbers between 6 and 10.

The fingers are numbered starting with thumb 6 and ending with pinkie 10.

So to muntiply 7x7 you join the two index fingers (7) together and count the number of fingers below and including the two joined index fingers. This comes to 4 (two index fingers and two thumbs). You now add a zero on to this number to give you 40.

You now count the number of fingers above the joined index fingers. That is 3 on each hand and you multiply them together 3x3 = 9

Now you add both results together 40 + 9 = 49 = 7x7

This method works for multiplying ANY numbers between 6 and 10.

GET THOSE FINGERS WORKING AND CHECK IT OUT.

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Comments

Emporer Rhubarb [deleted] says:

Say that again Bob...
Posted 59 months ago. ( permalink )

Steffe says:

And again please...
Posted 59 months ago. ( permalink )

GustavoG says:

Ah-ha. Can you please suggest a simple extension of the system for multiplying any two numbers with six to ten digits each?

Solutions involving six to ten dimensions are welcome.
Posted 59 months ago. ( permalink )

GustavoG says:

[Edited much later to add... who knows what deleted comment I was responding to with this, and with my next comment. When stuff is deleted, what's left kind of goes out of context, doesn't it?]

By the time they're done counting with their fingers, perhaps not many. ;)

Or is that the meaning of "go forth and multiply"?
Posted 59 months ago. ( permalink )

GustavoG says:

Let's get to the fair and square root of the problem. Should I not attempt to potentiate the use of my digits?
Posted 59 months ago. ( permalink )

rvacapinta says:

If you want to multiply by 9 theres an even easier finger method:

Hold up all your fingers in front of you. Number them from 1-10 (e.g. left pinky=1, right pinky=10)

To "multiply" hold down the number you want to multiply by (e.g. 6=right thumb). Now count the fingers to the left (5) and the fingers to the right (4). Answer is 54.
Posted 59 months ago. ( permalink )

rvacapinta says:

By the way, your method works if you have N fingers on each hand, then you can multiply numbers from N+1 to 2N on each hand. That is, if you had 50 fingers on each hand, this same method (numbering from 51 to 100) would also work.

It works because of cross-multiplication.
Posted 59 months ago. ( permalink )

Emporer Rhubarb [deleted] says:

I'm no good at maths bob, but I know where to hide my mouse tracks.
Posted 59 months ago. ( permalink )

Emporer Rhubarb [deleted] says:

I remember things visually Bob, I agree with what you say, I'm just hopeless at the stuff I was taught badly at school, I'll learn this system you mention, it may help me. I always remember our first Algebra lesson, "anyone heard of it? " Everyone except my classmates from my village, and the teacher sped on after a brief description leaving the slower of us behind forever.

I found it more difficult to play some punk tunes than when I played in a fake paddy band, they have 8 bars of c# for no reason for the solo, then back to another key.

What is that about clearing the cache....oops...
Posted 59 months ago. ( permalink )

Seuss says:

You can also do the 9 times table to 9 x 9 on 2 hands.

the hands are displayed fingers up...

I I I I I I I I I I

Then for example on 3 x 9 the fingers would appear like...

I I X I I I I I I I

Thus showing the answer 27.
Posted 59 months ago. ( permalink )

xinit says:

Saw it here:

attu.blogspot.com/2005/01/7x7-49.html
Posted 59 months ago. ( permalink )

pwinn says:

Wow, any numbers between 6 and 10? That's like, great! Hmm, that does leave out more than half of all problems involving single-digit numbers, but you can't have everything! ;-)
Posted 59 months ago. ( permalink )

txkimmers says:

xinit, that post was added just today.

Not to mention it doesn't look like that traffic-worthy a "blog".

Not to mention it has some young lady's wing wang featured front and center.

Not to mention..ew.
Posted 59 months ago. ( permalink )

Quiplash [deleted] says:

" Viewed 4161 times." :-)
Posted 59 months ago. ( permalink )

otherthings says:

Whoa. Definitely NSFW, xinit!

But I do recognize the url: a project of mine got blogged on the same site a few weeks ago, and it brought in lots of hits.

And before you ask: no, the project did not involve a wing wang.
Posted 58 months ago. ( permalink )

Maked [deleted] says:

Not to mention it has some young lady's wing wang featured front and center.

Wing Wang? WHERE? WHERE? WHERE?

How am I missing that? WHERE? WHERE WHERE?
Posted 58 months ago. ( permalink )

fubuki says:

hold down the ctrl key and tap the letter R repeatedly until your wrist goes carpal and seizes up or you bump your picture hits over 8000
Posted 58 months ago. ( permalink )

rvacapinta says:

Viewed 8706 times
Posted 58 months ago. ( permalink )

CharlotteWebGal says:

Neat photo.
And speaking of multiplying would you get a load of the number of views -wow!
Posted 58 months ago. ( permalink )

omegaman says:

more importantly, how did you take the picture? was the camera in your mouth?
Posted 58 months ago. ( permalink )

Just_Tom says:

If you think an image has been blogged, but google hasn't picked it up yet, you could tryTechnorati
Posted 58 months ago. ( permalink )

HyperBob says:

No not in my mouth.

I have incredibly strong sphincter muscles, and a minature camera.
Posted 56 months ago. ( permalink )

Maked [deleted] says:

Bob, thanks for that analysis.
Posted 53 months ago. ( permalink )

emdot says:

i can't believe this photo is approaching 15,000!! did you ever figure out who blogged it?
Posted 53 months ago. ( permalink )

Slippery Tiger says:

Sweet trick.
Posted 43 months ago. ( permalink )

motikat [deleted] says:

Great Hands!

Please help us create the largest collection of hands on the internet by adding your picture to Give Us A Hand Will Ya?? Pool. Thank you! :D
Posted 41 months ago. ( permalink )

public_int says:

genial
Posted 40 months ago. ( permalink )

Aenema says:

great!
Posted 40 months ago. ( permalink )

marco_antonio_davila says:

Muy curioso! Gracias!
Posted 40 months ago. ( permalink )

FlickrCrazy Guy says:

Hi, I'm an admin for a group called 7x7=49, and we'd love to have your photo added to the group.
Posted 23 months ago. ( permalink )

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Comments

Emporer Rhubarb [deleted] says:

Steffe says:

GustavoG says:

GustavoG says:

GustavoG says:

rvacapinta says:

rvacapinta says:

Emporer Rhubarb [deleted] says:

Emporer Rhubarb [deleted] says:

*Seuss* says:

xinit says:

pwinn says:

txkimmers says:

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otherthings says:

Maked [deleted] says:

fubuki says:

rvacapinta says:

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omegaman says:

Just_Tom says:

HyperBob says:

Maked [deleted] says:

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Seuss says: