Large Number Math, chilling at the asymptote

I remember thinking when will large number math apply, well I wish I had payed closer attention. If I remember correctly basic algebra rules apply to numbers approaching infinity. You can multiply by 1, you can multiply by the reciprocal to divide, infinity over infinity is equal to 1...I'll have to look this up in wikipedia to be certain.

I believe if you were to divide any number not approaching infinity by a number approaching infinity you would end up with an asymptote.

Why does this matter, you might ask? Well, increasingly I'm put in situations where large number computations ease the math of basic equations. Like inflation on a gallon of milk. Interest on stock markets. There seem to be lots of situations where a basic understanding of large number math would apply.

Sure it's not mission critical to have this down, but I feel that we were studying this in 8th grade and I should have a solid foundation.

found it... "
It is established that...

x + inf. = inf.
x * inf. = inf.

according to wikipedia no sensible extension exist for the following cases,

inf. * 0 (though you would want to say 0)
inf. - inf. (though you would want to say 0 or inf.)
inf. / inf. ( though you would want to say 1)

"

In conclusion only pseudo-specific conclusions can be drawn from operations done at infinity. ITS A SYMBOL NOT A NUMBER.