I’m pretty sure that I know what’s going on in this Geometry pre-assessment. (Thanks for the submission, RG!)
Notice that line there? The kid is counting squares. The dimensions of this rectangle are 10 by 6, and the kid is adding up 10, 10, 6 and 6 to get 32.
To me this is directly related to another perimeter/area mistake that I documented a few months ago. (Also related might be this.)