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.

Front

How do you evaluate the expression 2y when y = 8?

Back

Substitute 8 for y: 2 * 8 = 16.

Front

What is the result of evaluating p + 3 when p = 8?

Back

Substitute 8 for p: 8 + 3 = 11.

Front

How do you evaluate the expression 21 + 7x when x = 2?

Back

Substitute 2 for x: 21 + 7 * 2 = 21 + 14 = 35.

Front

What is the value of the expression 6y - 13 when y = 4?

Back

Substitute 4 for y: 6 * 4 - 13 = 24 - 13 = 11.

Front

How do you evaluate 3d when d = 5?

Back

Substitute 5 for d: 3 * 5 = 15.

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 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 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.