This is a PowerPoint presentation focused on 1st grade. The PowerPoint is to be used in conjunction with a cognitively guided instruction lesson focused on subtraction (multiples of 10) using the number line. It is the second lesson in a set of 3 lessons. Thus, this lesson moves from concrete understanding to visual understanding. The PowerPoint contains animations to model how to use the number line for subtraction. Moreover, it focuses on subtraction word problems (e.g., separate result unknown and separate change unknown).