When adding and subtracting rational expressions, we need to get a common denominator. This sometimes requires factoring to then find the least common denominator. The idea of these exercises scared Marcos a bit, but he did an excellent job! He worked on paper and on the board. I then showed him how to solve rational equations by eliminating the denominator. He had to find the Least Common Denominator, and then multiply each term of the equation by it. In cases where he had one rational term on each side of the equation, all he had to do was cross multiply, then solve the resulting equation. At times, the resulting equation is quadratic, which requires either factoring or the quadratic formula to solve. Marcos did a great job with all of the new topics!