Common Denominator by Justin Bieber

hye guys
one of the song that I like..good lyrics.. 
It's a math terms common denominator.. I guess he got inspire after doing some math homework.. without denominator no math problem could solve for fraction case..

I guess that's why when confession+girls+(love*jealous*act cute)=common denominator.
 even I was not thinking to do lyrics use my school subject.
one of the song before he became hits sensation. 

Songwriters: BIEBER, JUSTIN / CARR, LASHAUNDA OCTAVIS

Just a fraction of your love fills the air,
And I fall in love with you all over again,
You're the light that feeds the sun in my world,
I'd face a thousand years of pain for my girl.

Out of all the things in life that I could fear,
The only thing that would hurt me is if you weren't here
Woah oh oh oh

I don't want to go back
To just being one half of the equation
Do you understand what I'm sayin'?

Girl without you I'm lost
Can't fix this compass at heart
Between me and love,
You're the common denominator, oh, oh, ohh, oh
You're the common denominator, oh, oh, ohh, oh

Before your love was low, playin' girls was my high
You changed the game now I put my card in the side, eeyy
When broken hearts rise up to say love is a lie,
You and I will stand to be loves reply, yeah

Out of all the things in life that I could fear, yeah
The only thing that would hurt me is if you weren't here, here, here
Yeah, Yeah

I don't want to go back
To just being one half of the equation
Do you understand what I'm sayin'? (do you understand?)

Girl without you I'm lost
Can't fix this compass at heart
Between me and love
You're the common denominator, oh, oh, ohh, oh,
You're the common denominator, oh, oh, ohh, oh,

I can't imagine life without your touch,
And every kiss that you give, you fill me up
And through all the heart achin'
Jealous females hatin'
Imma hold it down for you, you

Oh, whoa...
Your the common denominator,
Oh, yeah, woahh,
I don't wanna to go back,

I don't wanna go back
To just being one half of the equation (half of the equation)
Do you understand what I'm sayin'? (oh, whoa)
Girl without you I'm lost
Can't fix this compass at heart
Between me and love
You're the common denominator (oh, oh, ohh, oh)
You're the common denominator (oh, oh, ohh, oh)

Just a fraction of your love fills the air,
And I fall in love with you all over again...

p/s : he wrote this by himself...impressive..good song for a guy to give to a girl..