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#1 2012-12-19 05:04:16
- RadioBoy
- Member
- Registered: 2012-12-19
- Posts: 1
Hello! This Is RadioBoy
Hello, I have just joined the math is fun forum. I expect interesting things here and will also share my experience of math. For example, the miracle of digit 9. The product of digit nine in interaction with itself will always be nine (9 x 9 = 18 = 1+8 =9).
If you are thinking of switching or using alternative energy in your home, solar power is the best choice that can sustain your lifestyle.
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#2 2012-12-19 05:40:06
- anonimnystefy
- Real Member
- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,049
Re: Hello! This Is RadioBoy
Hi RadioBoy
Welcone to the forum! 
Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.
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#3 2012-12-19 06:49:47
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Hello! This Is RadioBoy
Hi RadioBoy;
Welcome to the forum.
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.
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#4 2012-12-19 18:19:52
- Jai Ganesh
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- Registered: 2005-06-28
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Re: Hello! This Is RadioBoy
Hi RadioBoy,
Welcome to the forum!
It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.
Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.
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#5 2012-12-20 13:13:01
- MathsIsFun
- Administrator
- Registered: 2005-01-21
- Posts: 7,713
Re: Hello! This Is RadioBoy
Welcome!
"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman
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#6 2012-12-25 19:38:51
- mathaholic
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- From: Earth
- Registered: 2012-11-29
- Posts: 3,251
Re: Hello! This Is RadioBoy
Belated welcome to the forum, RadioBoy!
Mathaholic | 10th most active poster | Maker of the 350,000th post | Person | rrr's classmate
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#7 2012-12-25 20:56:07
- Bob
- Administrator
- Registered: 2010-06-20
- Posts: 10,621
Re: Hello! This Is RadioBoy
hi RadioBoy,
Welcome to the forum.
For example, the miracle of digit 9. The product of digit nine in interaction with itself will always be nine (9 x 9 = 18 = 1+8 =9).
or a number that reduces to nine eg. 109739369 x 9 = 987654321 ....9+8+7+6+5+4+3+2+1= 45 ... 4+5 = 9.
So here's a challenge:
Why does this happen?
Why doesn't it happen for, say, 7?
What other numbers does it happen for?
Bob
Children are not defined by school ...........The Fonz
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you! …………….Bob
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