Financial Literacy Grade 6: Credit and Debit Cards

Grade 6 Financial Literacy Study Guide: Credit and Debit Cards

1. The Driving Question

"If both credit and debit cards let you buy things without cash, why does one feel like ‘borrowed money’ and the other like ‘your own money’—and how can that tiny difference cost you hundreds of dollars if you mix them up?"

2. The Core Idea — Built, Not Listed

Imagine you’re at the school store buying a $5 water bottle. With a debit card, the money comes straight from your lunch account—like taking $5 out of your wallet. If you only have $3 left, the card gets declined. With a credit card, the bank lends you the $5 right now, but you have to pay it back later. If you don’t pay the full $5 by the due date, the bank charges you extra (called interest), turning that $5 water bottle into a $6 or $7 one over time.

This is why credit cards feel "free" at first—they let you spend money you don’t have yet. But just like borrowing a friend’s video game and not returning it on time might mean you owe them an extra snack, borrowing money from a bank means you’ll owe them extra cash. The key difference? A debit card is your money; a credit card is the bank’s money that you’re promising to pay back.

Key Vocabulary: - Debit Card: A card that takes money directly from your checking account when you make a purchase. Example: Using a debit card to buy a $12 movie ticket when your account has $50—your balance drops to $38 immediately. - Credit Card: A card that lets you borrow money from a bank to make purchases, which you must pay back later. Example: Buying a $30 video game with a credit card, then paying the bank $30 (or more) when the bill arrives. - Interest: The extra money you pay for borrowing, usually a percentage of the amount you owe. Example: If you owe $100 on a credit card with 20% interest and only pay $50, the next bill might charge you $10 extra for the remaining $50. - Overdraft Fee: A penalty your bank charges if you spend more money than you have in your checking account. Example: Using a debit card to buy a $15 lunch when your account has $10, then getting charged a $35 fee for "overdrafting."

3. Assessment Translation

How This Appears on State Tests (Grade 6): - Multiple Choice: Questions will ask you to identify differences between credit and debit cards (e.g., "Which card takes money directly from your bank account?") or calculate interest (e.g., "If you owe $200 on a credit card with 15% interest, how much extra will you pay if you don’t pay it off?"). - Distractor Patterns: Wrong answers might confuse interest with fees, or assume credit cards always charge interest (they don’t if you pay the full balance on time). - Short Answer: You might be asked to explain a scenario (e.g., "Your friend says, ‘I’ll just use my credit card for everything—it’s free money!’ What would you tell them?"). A proficient answer names at least two risks (e.g., debt, interest, fees) and one benefit (e.g., building credit).

What a Proficient Response Looks Like: Prompt: "Explain why using a credit card to buy a $50 pair of shoes could end up costing more than $50." Proficient Answer:

"If you don’t pay the full $50 by the due date, the credit card company will charge interest, which is like a fee for borrowing. For example, if the interest rate is 20%, you’d owe $10 extra after a year. Also, if you only pay the minimum (like $10), the interest keeps adding up, so the shoes could end up costing $60 or more. Debit cards don’t do this because they only use money you already have."

What Teachers Look For: - Developing: Mentions one difference (e.g., "credit cards let you borrow") but doesn’t explain how borrowing costs money. - Proficient: Names interest, fees, or overdrafts as risks; explains why credit cards can cost more. - Advanced: Compares specific numbers (e.g., "$50 at 20% interest = $60") or mentions long-term consequences (e.g., "bad credit scores").

4. Mistake Taxonomy

Mistake 1: Confusing "Available Credit" with "Money You Have" Prompt: "You have $100 in your checking account and a credit card with a $500 limit. Can you afford a $400 bike?" Common Wrong Answer: "Yes, because the credit card has a $500 limit." Why It Loses Credit: The question asks if you can afford it, not if the card allows it. The student ignores that credit cards are borrowed money. Correct Approach: - Debit card: $100 in checking-can only spend $100. - Credit card: $500 limit-$500 you own. If you spend $400, you’ll owe $400 + interest later. Ask: Can I pay this off in full when the bill comes?

Mistake 2: Ignoring Interest in Calculations Prompt: "You charge $200 to a credit card with 18% interest. If you pay $50 per month, how much extra will you pay in interest?" Common Wrong Answer: "$0, because I’m paying it off." Why It Loses Credit: The student assumes paying the minimum avoids interest. In reality, interest accrues on the remaining balance. Correct Approach: - Month 1: $200 balance-$3 interest (18%/12 months). Pay $50-$153 left. - Month 2: $153 + $2.30 interest-pay $50-$105.30 left. - Total interest: ~$10 over 4 months.

Mistake 3: Overdrafting a Debit Card Without Realizing It Prompt: "Your checking account has $25. You buy a $20 game with your debit card, then a $10 snack. What happens?" Common Wrong Answer: "The card gets declined after the $20 game." Why It Loses Credit: The student doesn’t account for overdraft fees. Many banks allow the $10 snack to go through, then charge a $35 fee for overdrawing. Correct Approach: - $25 - $20 = $5 left. - $5 - $10 = -$5-bank may approve the $10 but charge a $35 overdraft fee. - New balance: -$40. Always check your balance before swiping!

5. Connection Layer

1. Within Financial Literacy-Budgeting: Credit cards let you spend future income now, but budgets force you to plan for that future income. If your budget says you’ll earn $100 next month, a credit card lets you spend that $100 today—but only if you’re sure you can pay it back.
2. Across Subjects-Math (Percentages): Interest is just a percentage of a number, like calculating a tip or a discount. A 20% interest rate on $100 is the same math as a 20% tip on a $100 bill—except with interest, you are the one paying the extra.
3. Outside School-Online Subscriptions: Many apps (like Netflix or Xbox Game Pass) let you sign up with a credit card and "pay later." If you forget to cancel, the charges keep adding up—just like interest, but for things you don’t even use anymore.

6. The Stretch Question

"If debit cards are safer (no debt, no interest), why do adults use credit cards at all? Isn’t it smarter to just use debit for everything?"

Pointer Toward the Answer: Credit cards aren’t just about borrowing—they’re also about trust. Banks and landlords check your "credit score" (a number that shows how reliably you pay back money) when you want to rent an apartment or get a loan. Using a credit card responsibly (paying the full bill on time) builds a good score, like a financial report card. But if you only use debit, you don’t have a "history" of borrowing, which can make it harder to get approved for big things later. The catch? You have to treat credit like a debit card—only spend what you know you can pay back.