Understanding Variables and Expressions

The lesson focuses on writing expressions where letters stand for numbers. It covers defining variables to represent unknown quantities, writing expressions using these variables, and interpreting expressions in various contexts. Examples include age-related problems with Daniel and Alicia, book reading scenarios with Samantha and Julia, and cookie counting with June. The lesson emphasizes the importance of defining variables, using expressions to solve problems, and interpreting expressions in context.

What is the primary goal of today's lesson?

• To practice multiplication tables

• To understand how to define variables and write expressions

• To explore different types of literature

• To learn about historical events

If Daniel is 9 years old, how old is Alicia?

• 14 years old

• 9 years old

• 4 years old

• 5 years old

How do you represent Daniel's age if Alicia's age is x?

• x - 5

• x + 5

• 5x

• x / 5

If Julia read 32 books, how many books did Samantha read?

• 16 books

• 48 books

• 64 books

• 32 books

What expression represents the number of books Samantha read if Julia read x books?

• x / 2

• x - 2

• 2x

• x + 2

If Samantha read 100 books, how many did Julia read?

• 75 books

• 25 books

• 100 books

• 50 books

What does the expression 63 - x represent in the cookie example?

• The number of cookies added to the package

• The total number of cookies in the package

• The number of cookies eaten

• The number of cookies left in the package

If the cookie package is full, how many cookies does it contain?

• 100 cookies

• 32 cookies

• 63 cookies

• 50 cookies

What should you always include when defining a variable?

• The units of measurement

• A picture

• A detailed story

• A random number

What is a key takeaway from today's lesson?

• Variables should be defined clearly with units

• Always use fractions in expressions

• Expressions should be complex

• Avoid using variables in math