Mastery scores help students track their progress toward becoming an expert at various topics within NoRedInk. Think of mastery scores as a progress bar, rather than a percentage correct, tracing students' most recent progress and growth. A mastery score of 88, for example, suggests that a student is 88% of the way toward the goal, not that the student has answered 88% of questions correctly.
Students will earn progress towards their mastery in a topic by correctly answering questions associated with a given skill within NoRedInk. Most often, students will work towards mastery by completing Practice activities assigned to them by their teacher, or by completing practice independently via their "Learn" page. For more information on Practice, please see this section of our Help Center: Practice (Activity)
One thing to note is that mastery-based Practice is adaptive, such that questions get harder or easier based on a student's performance. Because of this, students will not all see the same questions, and some students may need more or less time to master a single skill. Generally, we estimate that it will take 5-10 minutes to master each skill on the site.