Math scores across the board have risen in the years after the pandemic, but a stubborn gap remains between poor schools and the state average.

After years of assigning the kind of homework she had done as a student and observing students’ disengagement with it, a teacher overhauled how she assigns math practice.

An analysis of data from 200,000 students using a computer-assisted math program supports an optimistic view of skill-focused, mastery-based learning, even with limited use. Many rigorous studies ...