Advocates of Common Core’s mathematics standards claim they are rigorous, reflect college-readiness, and are comparable with those of high achieving countries. But five of the 29 members of the Common Core Validation Committee refused to sign a report attesting that the standards are research-based, rigorous and internationally benchmarked. The report was released with 24 signatures and included no mention that five committee members refused to sign it. The two members of the Common Core Validation Committee with college-level mathematics content knowledge refused to sign off on them, finding them significantly lower than those of high-achieving countries.
You can download the white paper here or read it below: