Minecraft
Preparation
Lesson Narrative
In this lesson, students dissect the mechanics of a credit card. They will differentiate between statement balances, current balances, and minimum payments. By calculating compounding interest on carried balances, students will mathematically prove why the "minimum payment" is a predatory trap designed to keep consumers in perpetual debt.
Learning Goals
• Differentiate between a statement balance, current balance, and minimum payment.
• Explain the function of a credit card grace period.
• Calculate the long-term cost of only making minimum payments.
Student Facing Learning Goals
• Let's learn how credit cards actually work and how to use them without paying a single penny in interest.
Student Facing Learning Targets
• I can explain how to avoid credit card interest.
• I know the difference between my statement balance and my current balance.
• I can prove why making the minimum payment keeps people in debt.
Required Academic Standards
National Jump$tart Standards:
• Credit and Debt (Standard 1): Analyze the costs and benefits of various types of credit.
Glossary Entries
Statement Balance: The total amount owed at the end of a specific billing cycle.
Current Balance: The total amount owed right now, including recent purchases.
Grace Period: The time between the end of a billing cycle and your bill's due date where no interest is charged.
Minimum Payment: The smallest amount you can legally pay each month to keep the account in good standing, mostly covering just the interest.
Lesson
Warm Up
4.2.1: The Free Money Illusion
Launch: Have students stand in randomized groups of 3 at vertical whiteboards. Present the prompt verbally or project it. Give them 4 minutes.
Synthesis: Select two groups to share. Establish the baseline: A credit card is not free money; it is a high-interest, short-term loan. If you don't pay it back immediately, it becomes the most expensive money you will ever borrow.
Student Facing Task
You buy a $100 pair of shoes with a debit card, and the $100 leaves your checking account immediately. You buy a $100 pair of shoes with a credit card, and your checking account doesn't change at all.
1. Whose money did you just spend with the credit card?
2. When does that money actually leave your checking account?
Activity 1
4.2.2: Beating the Grace Period
Launch: Keep students at whiteboards. Project the billing cycle timeline. Give groups 8 minutes to analyze.
Synthesis: Have the class observe the boards. (Teacher Key: You must pay the Statement Balance by the due date. The Current balance includes things bought after the cycle ended). Explain the golden rule: Pay the statement balance in full, every single month, and you will never pay a dime in interest.
Student Facing Task
Your credit card bill arrives. It shows:
• Statement Balance: $500 (Purchases from Jan 1-31).
• Current Balance: $650 (Includes a $150 purchase from Feb 2).
• Due Date: Feb 21.
1. To avoid paying any interest, exactly how much money do you need to pay by Feb 21?
2. Why don't you have to pay the full $650 yet?
Activity 2
4.2.3: The Minimum Payment Trap
Launch: Present the minimum payment scenario. Give the whiteboard groups 10 minutes to calculate the compounding damage.
Synthesis: Facilitate a class debate. (Key: Paying only $30 means $20 goes to interest and only $10 to principal. It will take years to pay off a $1,000 TV). Explain that credit card companies want you to make the minimum payment because it maximizes their profit.
Student Facing Task
You owe $1,000 on a credit card at a 24% APR (2% per month). The credit card company says your "Minimum Payment" is only $30.
1. In the first month, calculate the interest charge (2% of $1,000).
2. If you make the $30 minimum payment, subtract the interest charge you just calculated. How much of your $30 actually goes toward paying off your $1,000 debt?
3. After your $30 payment, what is your new total debt?
Lesson Synthesis
Lesson Synthesis (5 min)
Narrative: Bring the class back to their seats. Review the student-facing learning targets. Summarize: "The credit card company is not your friend. The minimum payment is a mathematical trap designed to keep you paying interest for the rest of your life."
Cool Down
4.2.4: The Golden Rule
Narrative: This exit ticket serves as a formative assessment on the mechanics of credit card use.
Teacher Rubric: A successful response must articulate the two rules of credit cards: 1) Never spend money you don't already have in your checking account, and 2) Pay the "Statement Balance" in full, every single month, by the due date.
Student Facing Task
Explain the "Golden Rule" of credit cards. Exactly how much of your bill must you pay each month, and by what date, to guarantee you never pay interest to the credit card company?