Mr. R.’s World of Math

A cat that was fat and who liked to subtract,
Liked making small things go away…
One day she spied mice, and she treated them nice,
So 3 of them joined cat to play…

But then 1 was gone,
And fat cat played on,
Playing with 2 little mice,

Until there was 1,
And cat wasn’t done,
Playing with cat had a price…

Then there were none,
What had cat done?
She’d eaten the last little mouse…
Nope!
The friendly fat cat hadn’t done that,
She’d brought them to play at her house…