I am a paramecium
that cannot do a simple sum,
and it's a rather well-known fact
I'm quite unable to subtract.
If I'd an eye, I'd surely cry
about the way I multiply,
for though I've often tried and tried,
I do it backward....and divide.
-- Jack Prelutsky --
From New Kid on the Block, by Jack Pretlusky, published by Greenwillow Books, 1984.