guided notes - (4) algebra - variables and expressions

Name: ______________ Student ID: _____
Date: ______________ Page 12
Algebra: Variables and Expressions
Objectives: Today students will:
1. Evaluate simple algebraic expressions.
Warm-Up: Use order of operations to complete the following:
1.) 72 ÷ 3 - 5(8.8 - 6) + 9
2.) Insert parentheses to make the following statement true:
18 ÷ 12 - 3 + 4 = 6
A variable is a placeholder used to represent an unspecified value
in mathematical expressions.
Today weʼre going to discuss the branch of mathematics that
involves expressions with variables, or algebra.
Variable vs. Constant Algebraic vs. Numeric

Name: ______________ Student ID: _____
Date: ______________ Page 12
Steps for evaluating algebraic expressions.
Examples:
1.) Evaluate n + 3 if n = 4 2.) Evaluate 8w - 2v if w = 5 and v = 3
Step 1: Rewrite the expression, r__________ the variable with its
assigned value.
Step 2: E______ the expression using order of operations.
Additional Examples: Evaluate each example below if m = 8, n =
12, y = 3, b = 5, c = 4.
1.) mn 2.) y 2 + 2 3.) 5c + b
6 5
Independent Practice: Page 20, #14-34 (even).