This Fluency Activity is a part of the Lesson 2, Unit 1, Grade K. This fluency activity was selected in anticipation of future lessons. Although they do not work with numbers in this lesson, students need to develop fluency for upcoming lessons in which they work with numbers in depth. Let's practice counting with the Rekenrek. Show students the 20-bead Rekenrek with the side panel attached. Say how many you see.