Teachers and all other employees whose salaries or wages are payable out of the school current fund shall be paid for their services by orders duly signed by the president and secretary of the board in accordance with the following provisions:
(1) Notwithstanding any other provisions of this chapter and 18-1-1 et seq. of this code, the number of pays to be made during the school year to the various classes of employees shall be determined by the board: Provided, That the sum of such pays for any employee does not exceed the equivalent of an annual salary based upon 12 calendar months.