Below is a little math equation, made of matchsticks, that does not add up. Can you move just one match stick and fix the equation?

Below is a little math equation, made of matchsticks, that does not add up. Can you move just one match stick and fix the equation?

A woman was in her hotel room when suddenly there’s a knock on the door.
She opened the door to see a man whom she had never seen before. He said, “I’m sorry, I have made a mistake, I thought this was my room.” He then went down the corridor and in the elevator. The woman went back into her room and phoned security.
Why was the woman so suspicious?
Riddle AnswerA girl was ten on her last birthday, and will be twelve on her next birthday. How is this possible?
Riddle Answer