Subtracting Fractions Presentation: Combines teaching and practice in one! Instructional slides provide strategies for: Common Denominators, Equivalent Fractions, How to Subtract, and Simplifying Fractions. Each instructional skill includes student practice slides (3 problems each) with hidden answer keys. As students progress through the presentation, new skills have new practice problems that build and incorporate the previous skill. By the end of the activity, students should be able to solve a basic adding fraction problem such as: 2/3 - 1/8.