Grade 9: Missteaks

They are called missteaks because they’re not supposed to work, but they are delicious and full of protein.
We start with the equation

––simply cancel the 6’s. The problem is to find all other examples where the same trickery works.
Another example is
Again find the full set of similar examples. Want more?—how about
But the piece de resistance is yet to come. It starts with
––an apparently inconsequential oddity. But couple that with:
And we have the beginnings of a treasure hunt. Put the class in groups and see who is the first to find the next example.

Teacher manual