Expressions

Front

What is an expression in mathematics?

Back

An expression is a combination of numbers, variables, and operators (like +, -, ×, ÷) that represents a value.

Front

What does it mean to evaluate an expression?

Back

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

Front

What is the order of operations?

Back

The order of operations is a set of rules that tells you the sequence to follow when evaluating an expression: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right). This is often remembered by the acronym PEMDAS.

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.

Front

What does it mean to simplify an expression?

Back

To simplify an expression means to reduce it to its simplest form by combining like terms and performing operations.

Front

What is a term in an expression?

Back

A term is a single mathematical expression that can be a number, a variable, or a combination of both, separated by + or - signs.

Front

What is the sum of 4 and 9?

Back

The sum of 4 and 9 is 13.

Front

What is the product of 3 and the sum of 4 and 9?

Back

The product is 3 x (4 + 9) = 3 x 13 = 39.

Front

What is the difference between an expression and an equation?

Back

An expression does not have an equal sign and represents a value, while an equation has an equal sign and states that two expressions are equal.

Front

What is the value of 2 + 7 × 5?

Back

The value is 2 + (7 × 5) = 2 + 35 = 37.