Why not migrate the low-level "check my answer" type questions to math.se where they are receptive to them?
The "Economics" Stackexchange never made it out of Beta: there were so many beginner's level questions that no experts could stand the place. The "quantitative finance" site however has such an intimidating name that it successfully scares off the homework "check my answer" type people that regularly encounter the "closed as off topic" homework tag here on Physics.SE
Perhaps we appear too approachable. Maybe something more intimidating like "Quantitative Science" might scare off unwanted questions. Till then, why not migrate the "check my answer" questions to math.se where they are receptive to them?
Also, I believe that the Mechanical Engineering SE Beta failed for the same reason as Economics.SE