This Fluency Activity is a part of the Lesson 28, Unit 1, Grade 1. This activity continues to strengthen students' development of counting backward within the counting sequences up to 120. Tell students you are going to say a number aloud, and instruct them to think about the number that is 1 less. They do not need to raise their hands, as you will cold call students to say an answer. Begin with numbers within 10, and then expand to numbers within 40, then 80, and then 120.