Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

Pages: **1**

**soroban****Member**- Registered: 2007-03-09
- Posts: 451

.

. . . . . .

. . (Or name it after your favorite ethnic group.)

. . . . . . . . . .

. .

. . . . . . . . . .

. .

.

Offline

**DrSteve****Member**- Registered: 2010-11-15
- Posts: 10

Very interesting. I believe that you should include the original numbers you're multiplying by in the table (in this example they are crossed out because 76 is even).

Without giving away the details to others that want to prove this, the solution involves powers of 2.

**Challenge problem:**This technique can be generalized by using powers of n for any other fixed positive integer n>2. How would the algorithm change in this case? (Hint: you need one additional column).

If you're going to be taking the SAT, check out my book:

http://thesatmathprep.com/SAT_Sales_Page.html

Offline

**barbie19022002****Member**- Registered: 2013-05-24
- Posts: 1,314

For your kind information I searched this one in net it is actually Egyptian Multiplication.............

Jake is Alice's father, Jake is the ________ of Alice's father?

Why is T called island letter?

think, think, think and don't get up with a solution...

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 86,365

Hi;

I am afraid that it is mostly referred to in books as Russian peasant multiplication.

**In mathematics, you don't understand things. You just get used to them.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

**Online**

**barbie19022002****Member**- Registered: 2013-05-24
- Posts: 1,314

Its very silly, why will the Russian peasants use multiplication..........

Jake is Alice's father, Jake is the ________ of Alice's father?

Why is T called island letter?

think, think, think and don't get up with a solution...

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 86,365

If they did not multiply, they would be extinct.

**In mathematics, you don't understand things. You just get used to them.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

**Online**

**barbie19022002****Member**- Registered: 2013-05-24
- Posts: 1,314

Extinct? but peasants are still there in the world.... especially in India....

Jake is Alice's father, Jake is the ________ of Alice's father?

Why is T called island letter?

think, think, think and don't get up with a solution...

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 86,365

That is true so they are multiplying.

**In mathematics, you don't understand things. You just get used to them.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

**Online**

**barbie19022002****Member**- Registered: 2013-05-24
- Posts: 1,314

But, why only multiplication...why not addition... though it is a long process..

Why is T called island letter?

think, think, think and don't get up with a solution...

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 86,365

Hmmm, multiplying as in increasing the population.

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

**Online**

**barbie19022002****Member**- Registered: 2013-05-24
- Posts: 1,314

but, if the population increases then all the natural resources will be over...

Why is T called island letter?

think, think, think and don't get up with a solution...

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 86,365

That is true. But it is another question entirely.

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

**Online**

**barbie19022002****Member**- Registered: 2013-05-24
- Posts: 1,314

Ya, but in any how it is getting connected to it..

Why is T called island letter?

think, think, think and don't get up with a solution...

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 86,365

The comment was a play on words. Multiplying has two meanings.

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

**Online**

**barbie19022002****Member**- Registered: 2013-05-24
- Posts: 1,314

Ya, I did understand that...

Why is T called island letter?

think, think, think and don't get up with a solution...

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 86,365

Anyway, soroban is correct. If you can multiply and divide by 2 you can do RPM.

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

**Online**

**barbie19022002****Member**- Registered: 2013-05-24
- Posts: 1,314

RPM- you mean russian peasant multiplication??

Why is T called island letter?

think, think, think and don't get up with a solution...

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 86,365

It sure is. We already know those peasants know how to multiply.

Of course that result can be rigorously obtained, but who cares?

Combinatorics is Algebra and Algebra is Combinatorics.

**Online**

Pages: **1**