The sibling commenter is right re: bachelors and certifications, but due to shortages in the US often teachers with no certification in a subject are teaching.

The sibling commenter is right re: bachelors and certifications, but due to shortages in the US often teachers with no certification in a subject are teaching. See Table 2 in [1] and find that 70% of high school math teachers have a math major and 81% are certified, while 10% of public high school math teachers have neither a math major nor a certification in math. [1] https://nces.ed.gov/pubs2015/2015814.pdf https://nces.ed.gov/pubs2015/2015814.pdf