This teacher tool is a list of the factors for every number from 1 to 100. When students are asked to find the factors of a number, they often generate an incomplete list. This tool makes it easy for a teacher to tell students how many factors they are looking for. For example, instead of saying, "Find all the factors of 36." the teacher can say, "Find the nine factors of 36." I have found this to be an effective way to motivate students to work longer and more independently at the task of finding factors.