Earlier quoted context omitted.
I recently read something that stated we've never really had more than 30% of students in the US at a level of mathematical understanding where they can tell that 3/4ths and 0.75 are the same thing, conceptually. I cannot stop thinking about this; it honestly explains so much.
That’s probably one of those cases where they use two different statistics to assume a conclusion, e.g. maybe only 30% of students pass a particular profiency test, and then add to the fact that that test is the minimum level where fractions/percentages are expected to be known, and combine it to make a scary sounding headline. You might be right but, citation needed.
Additionally: https://www.nationsreportcard.gov/
22% of 12th graders are considered proficient in Math. This means:
NAEP Basic - Apply single-step percentages to solve real-world problems.
NAEP Proficient - Analyze information to solve real-world problems with proportional reasoning.
NAEP Advanced - Solve multi-step, real-world problems using percentages.