This sign brings Montana into Road Sign Math for the first time, however if it were about 50 feet west it would have been Idaho’s turn. Randy Weiss found this sign on a recent roadtrip. The shotgun blast on the sign proves, beyond a shadow of a doubt, that we are in Montana.

Square root signs are nothing new to Road Sign Math, in fact, they are somewhat like weeds. They just seem to keep popping up all over the place! They are not always the most elegant or impressive, but this sign is definitely an exception. The stunning simplicity of this square root deserves all the praise and elegance of the sign that inspired the hunt for mathematically significant roadsigns in the first place.

\sqrt{100} = 10

This sign is found US 20 heading eastbound, about 50 feet east of the Montana-Idaho border. The GPS coordinates are approximately N44 40 28.3 W111 16 33.1. See sign on map!