There are 5 sizes of numbers,
Big Infinity and small Zero,
And the Finite in the middle,
They’re the ones, I’m sure you know.

But now we look between Finite and Zero.
To numbers so small, they’re nothing at all,
But still a little larger than a Zero.
Their name is Infinitesimal.

On the other side of Finite,
There are numbers too large to say,
Infinites are what we call them,
They are big, in every way.

But they will never quite be Infinity,
They’re not quite as big, not even close.
We’ll use all of these numbers in Cal-cu-lus,
The numbers, I love the most.