Thanks for calling me out on the bad example, Martin!
I got my spaces mixed up with the dimensions in meters (72 meters across with 2 meter tiles = 36 spaces. The number should have read 35 spaces, to yield divisors 1, 5, 7, and 35, which are the numbers of columns that will fit evenly across that space, corner to corner. I’m sure there are much better solutions that I’ll learn in time, but this one worked for the particular problem posed in the tutorial.