This Fluency Activity is a part of the Lesson 2, Unit 6, Grade K. This activity continues students' progress toward mastery of the required fluency for kindergarten. Decide on a core fluency skill in which students would benefit from extra practice: addition, subtraction, or mixed addition with subtraction within 5. Select the Sprint that is most appropriate for the class: Core Fluency Sprint A, B, C, or D in the materials that follow. In order to correct the work as a class, all students take the same Sprint.