In many countries, would-be math teachers are required only to obtain passing grades of 51% in mathematics exams, so that a math student who has failed to understand 49% of the math syllabus throughout his or her education can, and often does, become a math teacher.
Számos országban a leendő matematikatanároknak elegendő a vizsgákon 51%-ot elérniük, tehát adott esetben egy tanárjelölt, aki a matematikai tanterv 49%-át nem érti, még oktathat, és gyakran oktat is.