This Fluency Activity is a part of the Lesson 27, Unit 2, Grade 1. This activity reviews the concept of ten as a unit and prepares students for today's lesson. Assign partners. Show a teen number with Hide Zero cards (e.g., 15). Partner A uses his magic counting sticks (fingers) to show a bundle of ten, and Partner B shows 5 ones. Ask students to identify how many tens and ones they made.