Line numbering puts line numbers in the margin. The line numbers are displayed on screen and are printed. The example below has numbering on every line.
Line numbering example.
Click Tools > Line Numbering and select the Show numbering checkbox in the top left corner. Then click OK.
You can choose how many lines are numbered (for example, every line or every tenth line), the numbering type and whether numbers restart on each page. In addition, a text separator (any text you choose) can be set on a different numbering scheme (one every 12 lines, for example).
Line numbering dialog box.