Original or Copy?

Linda Peyton, a third grade teacher at Rhein Benninghoven Elementary School in Shawnee Mission, Kansas

I put a broad yellow highlighter mark across the top of the original copy of any material I duplicate. Then it is easy to retrieve and return to my files after use. It sure saves wondering what happened to my original. More than once in the past I had my original mixed in with the copies, used by a student, and I was left without a clue as to what had happened to it!