Haha, good find. My Pre-Algebra and Algebra teachers use to hassle the students about their decimal places. My Algebra teacher gave a story of how she asked a man in Publix for .5 pounds of meat and the man ended up giving .05. When she asked for a correct amount he said that it was, she then asked for 0.5 again without the 0 before the 5 and the man told her "There is no difference take your meat and go home". I laugh at it every time.