### You have an arithmetic expression in front of you and you wonder: Do I have to add first, or do I multiply first? Maybe, you don't know if you have to do the parenthesis first, or the fraction.

### This lesson will guide you in a simple way to the process, the order of operations; when you work with expressions, or when you substitute in formulas. You will be an expert at the end of the lesson! Additionally, you will be able to highlight or write on the screen using the MARKER TOOLS menu available at the top of the screen. You have some useful definitions below the box were the lesson is displayed.

** Lesson's Content **

** Lesson's Glossary **

**Constant (monomial): It is a number or value that remains always the same. Never changes.**

**Evaluating a variable expression: Given an expression and values for the variables, it is the process of substituting these values in the expression and simplify it following the order of operations.**

**Formula: Any equation which states a rule in a relationship.**

**Grouping symbol: Parentheses, brackets, fraction bar are grouping symbols used to enclose an expression that should be simplified before other operations are performed.**

**Numerical expression: Any expression naming a particular numbers; also a numeral.**

** Power of a number: The product we obtain when a number is multiplied by itself a number of times; 3x3x3x3 is the fourth power of 3 or 34**

**Quadratic formula: Solutions of a quadratic equation in the form ***ax*^{2}* + bx + c* =0 and *b*^{2} - 4*ac *needs to be equal or greater than zero to yield real numbers.

**Simplifying a numerical expression: Changing any expression to the simplest name for its value.**

**Value of a numerical expression: The resulting number of the expression.**

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