1. Evaluating Expressions

2. Variables
In math we use symbols (called variables) to represents numbers that we do not know.
Symbols are usually letters such as x or y
What does the word variable sound like to you?

3. Term What does the word term mean to you?
Where have you seen this word in other subjects?
Ex: English – a single word that can be defined
How might we model this in mathematics?
A single number, letter, or combination of both.
Ex: 6, 5, x, z, 6y, 5x, 4z

4. Expressions What does the word expression mean?
Discuss what an algebraic expression might look like.
A single number, letter, term or the product of those separated by a + or -.
Is their a time an expression can also be a term?
Examples:
6n, 52x, 5y
6+n, x-5, x-y

5. Evaluate What does evaluate mean?
What are some non-math examples of evaluating?
How might we evaluate a math problem?
Substitute a specific value for each variable and then perform the operation.

6. Let’s Practice
WORKBOOK
Page 3 & 4