This Fluency Activity is a part of the Lesson 4, Unit 6, Grade 2. In this lesson, students understand that numbers other than 1, 10, and 100 can serve as units, and students represent the total of a given number of units with tape diagrams or using repeated addition, e.g., 2 + 2 + 2 + 2 = 8. Students add numbers within 20 to help gain mastery of the grade level fluency standard.