Most K-12 schools in the U.S. try to keep class sizes below 30. 20-25 is a good representative sample. Class size and the length of the school day are always ne

Most K-12 schools in the U.S. try to keep class sizes below 30. 20-25 is a good representative sample. Class size and the length of the school day are always negotiation points. As you probably experienced, class sizes above 30 are challenging even for the best of teachers.