5th Grade Expressions Review

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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 it mean to evaluate an expression?

Back

To evaluate an expression means to calculate its value by substituting numbers for the variables and performing the operations.

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What is the order of operations?

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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). This is often remembered by the acronym PEMDAS.

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What is a numerical expression?

Back

A numerical expression is a mathematical phrase that includes numbers and operation symbols but does not include variables.

Front

How do you write an expression for 'Add 36 and 20, multiply the sum by one-fourth, then subtract 10'?

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The value is 36.

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What does it mean for two expressions to be equal?

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Two expressions are equal if they have the same value when evaluated.

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What is a variable in an expression?

Back

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 equation and an expression?

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An equation is a mathematical statement that asserts the equality of two expressions, while an expression is a combination of numbers and variables without an equality sign.

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