Reasoning, not just results.

Independent reasoning check

Show how you got there.

We compare your working against an independent solution, then flag logic that happens to land on the right answer.

Submit your work

One solution, or up to six scans for a class review.

Add one or more photos of worked solutionsJPEG, PNG, or HEIC · up to 10 MB each · 6 papers per batch
or type one solution

What to expect

We look for the step a final answer can hide.

A correct answer is useful. Sound reasoning is reusable. When a shortcut only works by accident, you’ll see a counter-example that proves why.