This lesson is on adding and subtracting fractions. Out of all the topics in fractions adding and subtracting fractions seems to give students the most problems. From experience a student must master all previous fraction skills before taking on adding/subtracting fractions. Hence, a student should know how to reduce a fraction, multiply and divide fractions and find the LCM/LCD before starting this lesson. Once a student can confidently do the skills I just mentioned they should have no problem learning how to add and subtract fractions. I can’t stress how important fraction skills are in math so make sure you watch the lesson videos as much as needed to master the skills.