This Fluency Activity is a part of the Lesson 18, Unit 1, Grade K. Conduct the activity as outlined in Lesson 15, but this time, build incrementally to sequences beyond 5 as students exhibit mastery. A sample sequence is given below. 4, 5, beep! 4, beep, 6 Beep, 5, 6 6, 7, beep! Continue from simple to complex, identifying the number after, the number between, and finally, the number before, which is most difficult.