Understanding Variables, Expressions, and Equations

What is a variable in mathematics?

• A symbol representing an unknown value

• A type of equation

• A fixed number

• A mathematical operation

Which of the following best describes an expression?

• A type of variable

• A fixed value

• A math sentence with an equal sign

• A math phrase without an equal sign

In the expression 3d, what does the '3' represent?

• A multiplication operation

• An addition operation

• A division operation

• A subtraction operation

What is a key characteristic of an equation?

• It is always a simple math phrase

• It has no variables

• It has an equal sign and a defined variable value

• It has a variable that can change

If 3d = 39, what is the value of d?

• 14

• 13

• 12

• 11

A letter that represents a number.

• Addition
• Expression
• Algebra
• Variable

A letter that represents a number.

• Addition
• Expression
• Algebra
• Variable