Are you a teacher looking for creative bulletin board ideas for your classroom? Take inspiration from these 15 fun ideas for DIY back-to-school bulletin boards.

Pi was first applied to the third month, 14th day of the year by a physicist at the San Francisco Exploratorium in 1988, according to NASA. U.S. Congress declared March 14 National Pi Day in 2009.

National Pi Day is celebrated to give the constant value some attention. Pi, represented by the Greek letter "π," symbolizes the ratio of a circumference of a circle to its diameter (3.14).