Round Up!

In fifth grade math, we're working on rounding numbers.  Anything with five or higher needs to be rounded up!

This morning, as I was driving to work, I was following a car dead set on going 38 mph in a 45 mph zone.  All I could think was "Round up!  Round up!"  

I'm thinking that may mean I tend to drive a bit close to that rounded up 50 mph mark than ever heading down to the 40 mph mark.