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**1.1 Lesson – Evaluating Algebraic Expressions**

Essential Question p. 2 How can you write and evaluate an expression that represents a real-life problem?

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**A numerical expression contains only numbers and operations.**

An algebraic expression contains numbers, operations, and one or more variables. Here are some examples. Numerical Expression: · 3 Algebraic Expression: 45 ÷ p − q

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To evaluate an algebraic expression, substitute a number for each variable. Then use the order of operations to find the value of the numerical expression.

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