Math Is Fun Forum

MathsIsFun

Administrator

Registered: 2005-01-21

Posts: 7,713

Long Multiplication

A short page on Long Multiplication

Yes? No?

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"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

mikau

Member

Registered: 2005-08-22

Posts: 1,504

Re: Long Multiplication

looks good to me! What are you using to make those litle videos?

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A logarithm is just a misspelled algorithm.

MathsIsFun

Administrator

Registered: 2005-01-21

Posts: 7,713

Re: Long Multiplication

A homegrown "recorder" and "player" in flash.

The "recorder" creates a list of mouse moves, pen changes, etc, but still needs lots of tweaks to get it right.

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"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

John E. Franklin

Member

Registered: 2005-08-29

Posts: 3,588

Re: Long Multiplication

I made a video on long multiplication, a method I made up from something suggested in 5th grade to me.
Here it is:  http://www.youtube.com/watch?v=FickreBQYZ8

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igloo myrtilles fourmis

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Long Multiplication

Hi John E. Franklin;

Nice vid, a good example of multiplication and mastication. Made me hungry.

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

MathsIsFun

Administrator

Registered: 2005-01-21

Posts: 7,713

Re: Long Multiplication

What an interesting method! It seems quicker than the normal method, though not as transparent.

(Details of the Pizza were lacking, though.)

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"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

John E. Franklin

Member

Registered: 2005-08-29

Posts: 3,588

Re: Long Multiplication

Thanks for the comments guys!!  Happy ice skating at the arena!!

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igloo myrtilles fourmis

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Long Multiplication

Is there any pizza left?

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

John E. Franklin

Member

Registered: 2005-08-29

Posts: 3,588

Re: Long Multiplication

Sorry, no pizza left immediately available unless we go out to the pizza parlor, which would taste even better.  I'd like to see a pizza-math video in the restaurant next!!

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igloo myrtilles fourmis

Cecil Ned

Member

Registered: 2011-01-23

Posts: 4

Re: Long Multiplication

Long multiplication is the method of multiplication that is commonly taught to elementary school students throughout the world. It can be used on two numbers of arbitrarily large size or number of decimal digits. The numbers to be multiplied are placed vertically over one another with their least significant digits aligned. The top number is named the multiplicand and the lower number is the multiplier. The result of the multiplication is the product.
I hope this helps you!
______________________

Homework help

Last edited by Cecil Ned (2011-01-23 16:33:32)

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Long Multiplication

Hi Cecil Ned;

Welcome to the forum. John was demonstrating a new method. He does know how to multiply the old way. He also knows how to eat pizza.

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.