Evaluating Expressions

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What is the definition of an expression in mathematics?

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An expression is a combination of numbers, variables, and operators (such as +, -, *, /) that represents a value.

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What does it mean to evaluate an expression?

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To evaluate an expression means to calculate its value by substituting the variables with given numbers.

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What is the order of operations in mathematics?

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The order of operations is Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right), often abbreviated as PEMDAS.

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What is a variable in mathematics?

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A variable is a symbol (often a letter) that represents an unknown value in an expression or equation.

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What is the difference between an expression and an equation?

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An expression is a mathematical phrase that can contain numbers, variables, and operators, while an equation states that two expressions are equal.