This Fluency Activity is a part of the Lesson 13, Unit 3, Grade 1. This fluency activity strengthens the understanding of place value and prepares students for Module 4. Show students a number from 10 to 40 with Hide Zero cards. Students say an addition sentence with 10 as an addend. As students say the sentence, pull apart the Hide Zero cards to model the equation. Alternate asking students to say the numbers the Say Ten way and the regular way.