Kids Frequently Say the Darnedest Things About Rhythmic Values

This semester, nearly all my students (middle school, high school and college--everyone except beginners) have some sort of double-dotted quarter note rhythm in their music. I've had multiple occurrences of this scenario:

ME: So the double-dotted quarter note is like a quarter note tied to an eighth note, tied to a sixteenth note. How much is all of that worth?
KID: 1.75.

(While counting in decimals would solve the argument of the "and" vs. "te" subdivisions once and for all, it would be kind of annoying in regular usage. Imagine a director saying, "OK, everyone come in on the .5 of beat four.")