The numbers above and below the notes indicate the intervals with the melody. 10 and 13 are compound intervals larger than an octave: 10 (octave + a 3rd), 13 (octave + 6th).
Sometimes you will need to add a sharp or a flat here and there in order for your counterpoint to stay within the current mode or key.
Here is the PDF file for printing. After you complete this exercise, post your time to comments.