This Fluency Activity is a part of the Lesson 39, Unit 4, Grade K. This activity assesses students' progress toward mastery of the required fluency goal for kindergarten: Add and subtract within 5. Distribute the appropriate Practice Set based on student performance in Lesson 38. Students who correctly answered all questions on a Practice Set in the previous attempt should move to the next Practice Set. All other students should try to improve their scores on the same set they used in Lesson 38. Students complete as many problems as they can in 96 seconds.