How to Divide 125 Students into 6 Class Periods

Assuming you're referring to 125 students and want to know how many are in each class period, divide 125 by 6:

125 / 6 = 20.83

Since you can't have a fraction of a student, round up or down depending on the situation. For the most equal class sizes, round down to 20 students per period. If you want each class to have at least 21 students, round up to 21 students per period.