How do you make 13 marks on a paper 24 inches wide?

Get a yardstick. Near one end of the paper, Line up one end with one edge of the paper. Line up 26" with the other edge of the paper. The yardstick will be at an angle.

Make 13 marks (0, 2, 4 .. 24, 26).

Slide the yardstick down the paper. Repeat the above.

Connect corresponding marks.

Congratulations! You have divided 24-inch wide paper into 13 equal parts.

Now, your question is rather ambiguous -- for example, I can have my 4-year old make 13 marks with a crayon on 24-inch wide paper in about 3 seconds. But use the above technique to get what you want.