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

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**Math_Girl****Member**- Registered: 2007-07-27
- Posts: 23

Here are some useful videos i've found:

http://www.youtube.com/watch?v=6n8hKpLaWMI - This is a useful and clever multiplacation method using lines

http://www.youtube.com/watch?v=YFvwRzjTWAw - An even more useful method of multiplacation!

http://www.youtube.com/watch?v=nxsPlxYbLJ4 -This is about evaluating logarithms and is very well expalined

http://www.youtube.com/watch?v=a81YvrV7Vv8 - This is a great song sung by Tom Lehrer about "New Math"

http://www.youtube.com/watch?v=4tviuW6GHwY - The best song ever for learning pi to 30 decimal places!!!

http://www.youtube.com/watch?v=nmXkDbGdD4Q - This is called lose yourself in the digits and it's by pi diddy It's really funny and it's instead of eminem singing "Lose Yourself". The lyrics are great!!!!

http://www.youtube.com/watch?v=mhlc7peGlGg - This is about the monty hall problem and it explains it very well

http://www.youtube.com/watch?v=Ooa8nHKPZ5k - One of the funniest songs ever. It's called "What you know about math"

http://www.youtube.com/watch?v=ouJY6MzfGcg - Very funny video about a math test

I've forgoten how to do hyperlinks so if anyone knows it might make it easier

"Genius is 1% inspiration and 99% determination"

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**mathsyperson****Moderator**- Registered: 2005-06-22
- Posts: 4,900

I edited links into the post for you. For future reference, there are two main ways of making links.

The easier one is just to encase the link in [url]tags.

e.g. [ url ]www.google.com[ /url ] (without spaces) gives www.google.com.

Alternatively, you could put a description of the link by doing [ url={link} ]{description}[ /url ].

e.g. [ url=www.google.com ]Search engine[ /url ], without spaces, gives Search engine.

Why did the vector cross the road?

It wanted to be normal.

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**Math_Girl****Member**- Registered: 2007-07-27
- Posts: 23

Cheers

"Genius is 1% inspiration and 99% determination"

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**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,654

Great links, thanks.

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

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**Devantè****Real Member**- Registered: 2006-07-14
- Posts: 6,400

Mnemonics is not a good way to learn the digits of things like the natural logarithm (e) or pi. I can recite pi to a thousand decimal places, and e to around 720 or so, and I did not use any special methods other than my memory.

Memorising e is quite easy; Here is a guide for only the first 15 decimal places of e ...

e ≈ 2.718281828459045 (to 15 decimal places)

We all know e as approximately 2.7 (or 2.71). The next bit is simple ... 1828 twice. That's all it is. Two-point-seven ... one-eight-two-eight-one-eight-two-eight. Next are the angles of a perfect right-angled isosceles triange ... 45° 90° 45°, in that order precisely. Say that now.

There is actually a factual piece of text for memorising fifteen digits about a president of some country elected twice in 1828 (true story!). I posted it in an 'e' thread in the This Is Cool forum a while back. A year ago I also posted links to pi mnemonics for those who want to memorise pi, for .... whatever reason?

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**landof+****Member**- Registered: 2007-03-24
- Posts: 131

Those are great!

I shall be on leave until I say so...

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