Teachers are paid on a salary income that is prorated if the teacher begins teaching after the school year has already begun. This means that the teacher is paid only for the days he or she works and not for the school days that have already passed. In order to calculate the prorated salary for a teacher, you must first determine how much the teacher earns per day and multiply that number by the days remaining in the school year.

Write down the teacher's annual salary (for example, $40,000), the total number of working days in the school year (for example, 180), the number of working days that the teacher will be working (for example, 100) and the number of checks remaining in the contract year (for example, 10).

Divide the annual salary value by the total number of days in the school year to determine the daily pay rate. For the example, $40,000 divided by 180 is $222.22 a day.

Multiply the daily pay rate by the number of days the teacher will be working. For the example, $222.22 multiplied by 100 equals $22,222.22. This is the prorated salary.

Divide the prorated salary by the number of checks left in the contract cycle to determine the amount that will be paid out with each check. For the example, $22,222.22 divided by 10 is $2,222.22 per check.