Expressions and Variables

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

Evaluate the expression when x = 10: x + 7

Back

17

Front

Back

0

Front

How many terms are in the expression: 4c?

Back

1

Front

Evaluate the expression when x = 2 and y = 4: 3x - y

Back

2

Front

Back

5 + y

Front

What is a variable in mathematics?

Back

A variable is a symbol (often a letter) that represents an unknown 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 given numbers.

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.

Front

Evaluate the expression when x = 3: 2x + 5

Back

11