When we divide a quarter note to two we create two equal eighth notes. Two eighths are played at the same time of one quarter note. However eighths might also appear singly. They will look like this: We draw an eight note by filling up the circle in black and adding a one flag to the stem of the note.

How do you draw an 8th note? It is notated with an oval, filled-in note head and a straight note stem with one flag. (16th notes have two flags. Quarter and half notes have no flag.) Generally, (like all notes with stems) when quavers are below the middle line of the staff, they are drawn with stems to the right of the notehead, facing up.