This Fluency Activity is a part of the Lesson 2, Unit 3, Grade 2. Let's count by ones, tens, and hundreds. I'll hold bundles to show you what to count by. A bundle of 100 means count by hundreds, a bundle of 10 means count by tens, and a single straw means count by ones. Create visual support by writing the numbers on the board as students count. Let's start at 0.