[I have looked up the prefix “septi” since this exchange, and oops!–I was in error. “Septi” is a combining form that means seven, not five. “Penta” is a combining form for “five.”]
Mago, to Tia: You measured Canada?
Me: Yes. It was five.
Mago: Five?
Me: Yes.
Mago: Five what?
Me: Five septiCanadas.
Mago: What’s a septiCanada?
Me: If you take the area of Canada, and divide it by five, you have a septiCanada.
Mago: Wait, so when you were five, you took a map of Canada and measured it–
Me, laughing: No–
Mago: and you drew five lines through it–
Me, laughing: No–
Mago: and you called each one of them a septiCanada?
Me, laughing: No. I made that up just now.