It All Adds Up!

People are always pushing my buttons
which is actually quite a plus,
because if I didn't have so much time to divide
I'd probably make quite a fuss.

Everything adds up perfectly
when I'm brought on the scene,
especially if you're well aware
what all my buttons mean.

Because not all buttons are equal, you know;
The x is a sign of the times,
the check's the square root of all my problems
and the dot is the cent sign for dimes.

I can sit on your desk, or fit in your pocket,
you can use me at home or at school.
But the best thing about me is I'm always right
even when in the hands of a fool.

WHAT AM I?
(C) 1998, Arden Davidson

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A Calculator!