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

You are not logged in.

- Topics: Active | Unanswered

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,558

A short page on Long Multiplication

Yes? No?

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

Offline

**mikau****Member**- Registered: 2005-08-22
- Posts: 1,504

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

A logarithm is just a misspelled algorithm.

Offline

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,558

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.

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

Offline

**John E. Franklin****Member**- Registered: 2005-08-29
- Posts: 3,585

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

**igloo** **myrtilles** **fourmis**

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 91,650

Hi John E. Franklin;

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

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

Offline

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,558

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

(Details of the Pizza were lacking, though.)

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

Offline

**John E. Franklin****Member**- Registered: 2005-08-29
- Posts: 3,585

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

**igloo** **myrtilles** **fourmis**

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 91,650

Is there any pizza left?

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

Offline

**John E. Franklin****Member**- Registered: 2005-08-29
- Posts: 3,585

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!!

**igloo** **myrtilles** **fourmis**

Offline

**Cecil Ned****Member**- Registered: 2011-01-23
- Posts: 4

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!

______________________

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 91,650

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.

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

Offline