Expressions and Order of Operations

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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 the order of operations tell us?

Back

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

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The value is 8.

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How do you calculate the total cost of items?

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To calculate the total cost, add the prices of all items together.

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Back

Front

What is a variable in an expression?

Back

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

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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 numbers for variables and performing the operations.

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The result is 16.

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What is the purpose of parentheses in an expression?

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Parentheses indicate which operations should be performed first in an expression.

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The value is 22.