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 2012-12-19 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: The Foundation
Registered: 2011-05-23
Posts: 15,544

Re: Hello! This Is RadioBoy

Hi RadioBoy

Welcone to the forum! smile


“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

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#3 2012-12-19 06:49:47

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 87,237

Re: Hello! This Is RadioBoy

Hi RadioBoy;

Welcome to the forum.


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

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#4 2012-12-19 18:19:52

ganesh
Moderator
Registered: 2005-06-28
Posts: 14,528

Re: Hello! This Is RadioBoy

Hi RadioBoy,

Welcome to the forum!


Character is who you are when no one is looking.

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#5 2012-12-20 13:13:01

MathsIsFun
Administrator
Registered: 2005-01-21
Posts: 7,535

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
Member
From: Juliania
Registered: 2012-11-29
Posts: 2,845
Website

Re: Hello! This Is RadioBoy

Belated welcome to the forum, RadioBoy!


"Double the fun, double the thrill, double the coolness" - Julianthewiki

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#7 2012-12-25 20:56:07

bob bundy
Moderator
Registered: 2010-06-20
Posts: 6,426

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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