Expressions with Variables and Operations

The video tutorial introduces the concept of variables in math, explaining how they can represent unknown numbers. It covers basic operations like multiplication, addition, subtraction, and division using variables. The tutorial also demonstrates how to construct complex expressions with variables, providing examples and encouraging student participation to reinforce understanding.

What is a variable in math typically represented by?

• Shapes

• Numbers

• Letters

• Symbols

When writing expressions with variables, what do we use if the number is unknown?

• A specific number

• A letter

• A symbol

• A shape

How do you represent 'twice a number' using a variable y?

• y / 2

• y + 2

• 2y

• y - 2

What operation is used to express 'two more than a number'?

• Addition

• Subtraction

• Division

• Multiplication

How would you write 'two more than a number y'?

• y / 2

• 2y

• y - 2

• y + 2

What operation is used to express 'two less than a number'?

• Multiplication

• Division

• Subtraction

• Addition

How would you write 'two less than a number y'?

• y - 2

• 2y

• y / 2

• y + 2

What operation is used to find 'half of a number'?

• Division

• Addition

• Multiplication

• Subtraction

How would you write 'half of a number y'?

• y + 2

• y - 2

• y / 2

• 2y

If you don't know the number of dogs you saw, how can you express '10 less than that number'?

• y / 10

• 10y

• y - 10

• y + 10