Understanding Variables in Mathematics

The video tutorial explains the concept of variables in mathematical expressions. It defines a variable as a placeholder for numbers that can change, using 'y' as an example. The tutorial demonstrates how variables are represented by letters and can take any numerical value. It also clarifies that constants like 3 or 4 in an expression are not variables. The video concludes by emphasizing the importance of recognizing variables as letters that can represent any number in an expression.

What is a variable in mathematical expressions?

• A fixed number

• A letter representing a number that can change

• A constant value

• A symbol for addition

In the expression 3y^3, what does 'y' represent?

• A multiplication sign

• A variable that can be any number

• A fixed value of 3

• A constant number

Which of the following is NOT a variable?

• z

• x

• 3

• y

How can you identify a variable in an expression?

• It is a letter that can represent any number

• It is a fixed value

• It is always a number

• It is a symbol for subtraction

What role does a variable play in an expression?

• It divides two numbers

• It is a constant multiplier

• It represents a number that can change

• It adds two numbers