Variables in Everyday Life
Year 7 Mathematics WALT: We Are Learning To recognise algebraic variables and their daily applications 30 minutes
What is a Variable?
A letter or symbol that stands for a number We don't know the exact value yet The value can change depending on the situation Examples: x, y, A, n, p
Rectangle Area Formula
Look at this formula: A = l × w A represents the Area l represents the length w represents the width What happens when we change l or w?
Variables in Daily Life
{"left":"Shopping: Cost = Price × Number of items\nSports: Total Points = Goals × 6 + Behinds × 1\nCooking: Servings = Recipe × People","right":"Travel: Distance = Speed × Time\nWages: Pay = Hours × Rate\nPhone Bill: Cost = Monthly fee + Data charges"}
Let's Practice Together!
If A = l × w and l = 5 metres, w = 3 metres What is A? Step 1: Write the formula Step 2: Substitute the numbers Step 3: Calculate the answer
Card Matching Game
Match the situation with the variable Number of apples → n Price per apple → p Total cost → C Formula: C = p × n
Create Your Own Formula
Think of a situation from your daily life Identify what changes (the variables) Write a simple formula Example: Movie tickets = Number of people × Ticket price Share with the class!
Success Criteria Check
✓ I can identify variables in real-life formulas ✓ I can explain what variables represent ✓ I can substitute values into simple expressions Well done, mathematicians!