Why did Cinderella lose her glass slipper at midnight? Maybe it was because she thought it was only noon! Join us in this lesson as we learn the difference between AM and PM. Students learn that AM refers to the first 12 hours in a day; then, at noon we change to PM to discuss the second 12 hours in a day. At midnight, we change back to AM and begin a brand new day! Don't worry Cinderella, we'll help you learn to tell time.