This Fluency Activity is a part of the Lesson 1, Unit 1, Grade 2. East Asian or Say Ten counting (e.g., 13 is said ten 3) matches the base ten structure of numbers. In contrast, the English language says the ten after the ones (e.g., four-teen). This makes fourteen easily confused with forty. Since Kindergarten, in A Story of Units, students have been counting the Say Ten way, a practice substantiated by research.
