Evaluating Expressions

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What is 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 their given values.

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44

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12

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6

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11

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7

Front

What is a variable in an expression?

Back

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

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What is a coefficient in an expression?

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A coefficient is a numerical factor that multiplies a variable in an expression.

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What is the order of operations in mathematics?

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The order of operations is a set of rules that determines the sequence in which calculations are performed: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right) - often abbreviated as PEMDAS.