Fourth grade math scores stagnated for the first time in two decades on a prominent nationwide test, prompting calls for new efforts to improve teacher content knowledge and stirring discussion of the potential benefits of setting more-uniform academic standards across states. The results on the National Assessment of Educational Progress,…

Thirteen years ago, Minnesota was a state with no academic standards in mathematics and science and what some observers said was a mixed record in grounding students in crucial academic content, such as number skills and algebra. Since then, the state has set clear guidelines for schools in both subjects, and it also appears to have tuned up what…