This Fluency Activity is a part of the Lesson 15, Unit 1, Grade 1. Providing students with ongoing counting practice throughout the year builds and maintains their counting skills, which are foundational for later first grade work with adding and subtracting tens. Repeat the Happy Counting activity from Lesson 3 Fluency Practice, counting by tens the Say Ten Way. First, count from 0 to 50 and back. Then, count from 7 to 77 and back.