This Fluency Activity is a part of the Lesson 3, Unit 3, Grade 1. This fluency activity strengthens students' ability to understand number relationships and to recognize counting patterns. Say a series of three or more numbers, but replace one of the numbers with the word beep (e.g., 15, 16, beep). When signaled, students say the number that was replaced by the word beep in the sequence. Scaffold number sequences, beginning with easy sequences and moving to more complex ones. Be sure to include forward and backward number sequences and to change the sequential placement of the beep.