To find the scale factor used to create the travel version of the triangular piece from the original, we divide the side length of the travel version by the side length of the original version.
The original triangle measures 3 inches on each side, and the travel version measures 0.5 inches on each side.
Scale factor = (Side length of travel version) / (Side length of original version)
Scale factor = 0.5 inches / 3 inches
Scale factor = 0.5 / 3
Scale factor = 1 / 6
So the scale factor is \( \frac{1}{6} \).
The correct response is: 1 sixth