Folding Cardboard

• 1). Lay your cardboard on a flat surface.
  
  
• 2). Lay your ruler down where you would like your fold to be. Trace against the ruler with your pencil.
  
  
• 3). Turn your ruler so it is perpendicular to your cardboard (instead of flat against it) and press down creating a dent or crease. If your cardboard is longer than your ruler, repeat these steps until you have a crease running the length desired.
  
  
• 4). Leave your ruler against the cardboard and fold one side up against the width of the ruler. This creates a straight fold. Continue folding against the ruler to fold the desired length.