Last night, I was checking math homework. The question was, "What is the perimeter of a square where each side is 5 meters long?"
And, for the answer, Marie had written "Yes."
So I called her back and showed her that "Yes" is not the answer. I explained how you find the perimeter. She went back to her desk, and a few minutes later came back and said she'd fixed it.
Now the answer said "No."
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