In the US, rules are not so strict. In 2007-08, 71.6 percent of secondary math teachers had been math majors. An additional 16.2 percent were certified in math

In the US, rules are not so strict. In 2007-08, 71.6 percent of secondary math teachers had been math majors. An additional 16.2 percent were certified in math but did not do a math major. 12.2 percent of secondary math teachers had neither a major nor a certification in math [1]. The number of uncertified non-math-major math teachers is much higher in lower grades, as you point out. [1] https://nces.ed.gov/fastfacts/display.asp?id=58 https://nces.ed.gov/fastfacts/display.asp?id=58