Evaluating Expressions

Front

What is an expression in mathematics?

Back

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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2

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Substitute the value of b into the expression and calculate.

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13

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53

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First, substitute c and d, then calculate the expression step by step.

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10

Front

What is the order of operations in evaluating expressions?

Back

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.

Front

What is a variable in an expression?

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