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

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#1 2012-12-20 04:04:16

RadioBoy
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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.

 

#2 2012-12-20 04:40:06

anonimnystefy
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Re: Hello! This Is RadioBoy

Hi RadioBoy

Welcone to the forum! smile


The limit operator is just an excuse for doing something you know you can't.
“It's the subject that nobody knows anything about that we can all talk about!” ― Richard Feynman
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
 

#3 2012-12-20 05:49:47

bobbym
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Re: Hello! This Is RadioBoy

Hi RadioBoy;

Welcome to the forum.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.
 

#4 2012-12-20 17:19:52

ganesh
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Re: Hello! This Is RadioBoy

Hi RadioBoy,

Welcome to the forum!


Character is who you are when no one is looking.
 

#5 2012-12-21 12:13:01

MathsIsFun
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Re: Hello! This Is RadioBoy

Welcome!


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

#6 2012-12-26 18:38:51

mathaholic
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Re: Hello! This Is RadioBoy

Belated welcome to the forum, RadioBoy!


246 pages on Prime Numbers Wiki (+1)
 

#7 2012-12-26 19:56:07

bob bundy
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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


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
 

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