1. The document discusses algebraic operations such as simplifying fractions, adding and subtracting fractions, and multiplying and dividing fractions. It provides examples of how to perform these operations on both simple and algebraic fractions. 2. Methods for changing the subject of a formula are described. The "change side, change sign" rule is introduced for solving equations and changing the subject of formulas. Examples demonstrate using this rule to make different variables the subject of given formulas. 3. Harder examples of changing the subject of a formula are presented, including formulas involving square and square root terms. Readers are instructed on applying the same methods to these more difficult formulas.