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 a variable?

Back

A variable is a symbol (often a letter) that represents an unknown value in an expression or equation.

Front

What is the order of operations?

Back

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) - often remembered as PEMDAS.

Front

If r = 13, what is the value of 2r + 1?

Back

2(13) + 1 = 26 + 1 = 27.

Front

What does it mean to plug in a value for a variable?

Back

Plugging in a value means substituting the variable with a specific number to evaluate the expression.

Front

What is the result of 4 × p if p = 2?

Back

4 × 2 = 8.

Front

If n = 11, what is the value of 3n?

Back

3(11) = 33.

Front

What is the value of x + 6 if x = 5?

Back

5 + 6 = 11.

Front

What is the product of p × p × p if p = 2?

Back

2 × 2 × 2 = 8.