This Fluency Activity is a part of the Lesson 2, Unit 2, Grade 1.: This activity strengthens students' understanding of the place value system as it relates to counting. Call out numbers between 10 and 20, alternating between saying the number the regular way or the Say Ten way. When the teacher uses the Say Ten way, students say the number the regular way. When the teacher uses the regular way, students say it the Say Ten way. Play for a minute, and then give students a chance to be the caller.