I Am Obsessed With Numbers

The Elusive Yet Necessary Number... Oh you number
You elusive value
I add you
Subtract you
Divide
And multiply
Even fracture
You into parts
Called fractions
You can be real
Or imaginary
You can be infinite
Or infinitesimal
Rational sometimes
Irrational many
I square you
Take your root
Use you to order my favorite meal
Count out my change to the cashier
But you are always my friend
Ever changing
But always faithful