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

If x = -7, what does -5 + 3x equal?

Back

-26

Front

Evaluate m - n if m = 29 and n = 11.

Back

18

Front

What does 4(x - 1) equal when x = 1?

Back

0

Front

If p = -6, what does p + 4 equal?

Back

-2

Front

Evaluate when a = 15: 2(a - 5) + 2.

Back

22

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 calculations are performed: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).

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 does it mean to substitute a value in an expression?

Back

To substitute a value means to replace a variable in an expression with a specific number.