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.

Front

What does it mean to evaluate an expression?

Back

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

Front

What is the order of operations in mathematics?

Back

The order of operations is a set of rules that dictates 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.

Front

How do you simplify an expression?

Back

To simplify an expression, combine like terms and perform operations according to the order of operations.

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 or equation.

Front

What is the difference between an expression and an equation?

Back

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

Front

What is the value of the expression (7 + 8) x 2?

Back

The value of the expression (7 + 8) x 2 is 30.

Front

What is the first step in evaluating the expression (7 + 8) x 2?

Back

The first step is to evaluate the expression inside the parentheses, which is 7 + 8 = 15.

Front

What is the result of multiplying 15 by 2?

Back

The result of multiplying 15 by 2 is 30.

Front

What are like terms in an expression?

Back

Like terms are terms that have the same variable raised to the same power, allowing them to be combined.