How to determine distance needed to move?

I am new to Vex Go. How do students determine the distance needed to drive for the drive block? Short of just showing them what it has in the lesson, I want them to be able to figure it out on their own.

Utilizing a beam, two holes equal one inch

Hi Shannon. Welcome to the community!

The GO Tiles are 12 inches wide (or 300mm). So from one black line to the center of the middle one is about 6 inches or 150mm. That’s what I tend to use when estimating distances.