Simplifying Fractions PowerPoint Slides. + Using Highest Common Factor. (H.C.F). Mini Lesson. Teaching PowerPoint Slides.These PowerPoint slides focus on simplifying fractions. There are three sets of teaching slides, the first set focuses on introducing students to the idea of simplifying fractions, the second set focuses on how to find the highest common factor, and the third focuses on how to simplify fractions using the highest common factor. They can be used as a mini-review or lesson with