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 the variables with their given values and performing the operations.

Front

What is the value of the expression 3d + n when d = 3 and n = 2?

Back

The value is 11.

Front

How do you evaluate the expression y + 18 for y = 23?

Back

Substitute 23 for y: 23 + 18 = 41.

Front

What is the result of evaluating 4y when y = 3?

Back

The result is 12.

Front

How do you evaluate the expression 30 + r^2 for r = 3?

Back

Substitute 3 for r: 30 + (3^2) = 30 + 9 = 39.

Front

What is the value of the expression 4r + 2 when r = 4?

Back

The value is 18.

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 is the order of operations in mathematics?

Back

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

Front

What is the difference between an equation and an expression?

Back

An equation states that two expressions are equal, while an expression does not include an equality sign.