In one group, parents took on a math problem intended to illustrate the concept of “proportional relationships,” which are part of the 8th grade Common Core standards ... Was that closer to striking ...

For example, the Common Core math standards say ... At lower grade levels, the standards mention content only in extremely general terms. Third-graders, for example, are supposed to be able ...

For five years, a San Francisco foundation funded, and a research organization closely monitored, a collaboration by 10 California districts to raise achievement under the Common Core math standards .