Variables and Expressions Introduction

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Math variables and expressions illustration

📚 Part 1: Understanding Key Terms

1. What is a variable?

A number that never changes

A symbol (usually a letter) that represents a number that can change

An equal sign in math

A math operation like addition

2. Which of these is an expression? (Choose one)

3x + 5 = 20

3x + 5

x = 7

2 + 2 = 4

3. What is the difference between an expression and an equation?

Expressions have equal signs, equations don't

Equations have equal signs, expressions don't

They are exactly the same thing

Expressions only use addition

4. In the expression 4y + 7, identify the parts:

The variable is: _________

The constant (number without a variable) is: _________

✏️ Part 2: Writing Expressions

5. Write an expression for each word phrase:

a) A number plus 8: ___________

b) Five times a number: ___________

c) A number minus 3: ___________

d) Seven more than twice a number: ___________

6. Circle the variables in these expressions:

a) 2x + 9

b) 5a - 4

c) 3m + 2n + 1

d) 6 + 4b

7. Create your own expression using the variable 'z' and explain what it could represent:

My expression: ___________________

🎯 Part 3: Real-World Connections

8. Sarah buys some pencils for $2 each and a notebook for $5. Write an expression to show the total cost if she buys 'p' pencils:

Expression: ___________________

9. In your own words, explain what a variable is and give an example:

10. Challenge: Create an expression with two different variables and explain what each variable could represent:

My expression: ___________________

Variables and Expressions Introduction

Variables and Expressions Introduction

📚 Part 1: Understanding Key Terms

✏️ Part 2: Writing Expressions

🎯 Part 3: Real-World Connections

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