Interest Engine Slides Unit 1: Money Moves
INTEREST
ENGINE
How money makes money while you sleep.
Financial Literacy 101
The Big Choice
Option A
Receive $1,000,000 cash today.
OR
Option B
A magic penny that doubles every day for 31 days.
Which one makes you wealthier by the end of the month?
Think: How fast can growth really happen?
Simple Interest
Interest earned only on the principal amount.
The Formula
\[I = P \cdot r \cdot t\]
I Interest Earned ($)
P Principal (Initial Deposit)
r Interest Rate (as a decimal)
t Time (in years)
Example
Deposit $1,000 at 5% for 3 years.
1,000 × 0.05 × 3 = $150
You earn $50 every year, no matter how much is in the bank.
Compound Interest
Interest earned on the principal AND on the interest already earned.
Total Balance (A)
\[A = P(1 + \frac{r}{n})^{nt}\]
n = Compounding periods per year
Monthly: n=12
Quarterly: n=4
Daily: n=365
Snowball Effect
The interest you earn starts earning its own interest.
Time is Your Ally
The longer you leave it, the faster it grows.
The Great Growth Race
Simple Growth
Linear. Predictable. Steady.
Compound Growth
Exponential. Explosive. The Engine.
The Truth in Banking
APY
Banks often advertise a "Nominal Rate", but the Annual Percentage Yield tells you what you actually earn after compounding is calculated.
Interest Rate: 5%
This is just the basic sticker price.
Compounding: Daily
The money is being added back 365 times.
APY: 5.13%
Always look for APY to compare different bank accounts!
The Reveal
Option A
$1,000,000
Still just a million.
Option B (The Penny)
$10,737,418.24
The Power of Compounding!
"Compound interest is the eighth wonder of the world. He who understands it, earns it... he who doesn't, pays it." — Albert Einstein
NOW IT'S YOUR TURN
1
Calculate
Use the formulas to find simple and compound interest for different scenarios.
2
Compare
Determine which bank account grows faster using APY comparison.
3
Predict
Show how leaving your money for 10, 20, or 30 years changes your wealth.
Grab the Growth Gains Worksheet and let's fire up the interest engine!
Growth Gains Worksheet Growth Gains
Interest Engine Mission Log
Name:
Date:
Simple Interest
\[I = P \cdot r \cdot t\]
Interest is only calculated on the initial principal.
Compound Interest
\[A = P(1 + \frac{r}{n})^{nt}\]
Interest is calculated on the principal AND previous interest.
Part 1: The Basics
Calculate the simple interest and the final balance for the following scenarios. Show your work!
Scenario #1
Principal: $2,500
Work Area:
Total Interest (I)
Final Balance (A)
Scenario #2
Principal: $500
Work Area:
Total Interest (I)
Final Balance (A)
Part 2: The Snowball
Imagine you deposit $10,000 into an account with a 5% interest rate . Compare how the money grows after 10 years depending on the method.
Simple Interest
Show Work Here:
Simple Balance after 10 years:
Compound Interest (Monthly)
Show Work Here (n=12):
Compound Balance after 10 years:
The Analysis:
How much extra money did you earn simply by using compound interest instead of simple interest? Why does this happen? Explain below.
Part 3: The APY Hunt
You are choosing between two high-yield savings accounts. Which one is the better deal? Use what you know about APY (Annual Percentage Yield) .
Bank A
4.25% Interest
• Simple Interest
• No Compounding
Bank B
4.20% Interest
• Compounded Monthly (n=12)
• Interest on Interest
Recommendation & Reasoning:
Banking Masterclass Teacher Guide Banking Masterclass
Facilitation Guide
Duration
5 Days
The Mission
This sequence transforms passive students into proactive "financial detectives." By the end of the unit, students should not only know how to calculate interest and identify fees but also feel empowered to navigate digital banking platforms securely and verify the bank's work through reconciliation.
Essential Questions
How does the mathematical choice of interest type impact long-term wealth?
Why is "reading the fine print" a defensive financial skill?
How can automated digital tools be used for financial protection rather than just convenience?
Unit Keywords
Principal APY Compounding Overdraft Phishing MFA Reconciliation Outstanding
Battle Plan by Lesson
1
Interest Engine
Key Strategy: The Magic Penny Hook. Ensure students manually calculate the first 5 days of doubling to feel the slow start of exponential growth before revealing the $10M total.
Differentiation: For advanced students, introduce the "Rule of 72" as a shortcut for compounding.
2
Fee Trap Fighters
Key Strategy: Roleplay. Have students pretend to be "Alex" in the case study and defend their bank choice to a classmate. This encourages them to justify costs vs. benefits.
Reality Check: Discuss the concept of a "soft overdraft" where banks might waive a first-time fee—empower students to know they can ask!
3/4
Digital Dash & Cyber Guard
Key Strategy: Simulation. If tech is available, show actual screenshots of banking apps. If not, use the "Phishing Detective" worksheet as a tabletop game where students earn "Security Points" for every red flag found.
Watch Out: Many students confuse "Passphrase" with just a long password. Emphasize that the randomness of the words is what makes it strong.
5
Balance Master
Key Strategy: Collaborative Auditing. Let students work in pairs to find the "Outstanding Items." One student reads the Register, the other reads the Statement. If it matches, they both shout "Verified!"
Common Misconception: Students often think "Outstanding" means "Very good." Clarify that in banking, it means "Waiting to be finished."
Success Metrics
Students have mastered the material if they can:
Fee Trap Fighters Slides Lesson 2: Hidden Costs
FEE TRAP
FIGHTERS
Protecting your balance from the banking "fine print."
Guard Your Gold
The Mystery of the $40 Coffee
The Receipt:
1 x Grande Latte ....... $5.00
The Bank Statement:
Coffee Shop ........... -$5.00
Overdraft Fee ......... -$35.00
TOTAL COST: $40.00
How does a $5 purchase turn into a $40 nightmare?
Is this legal? Is it fair? How could it have been avoided?
The "Usual Suspects"
Four common ways banks slowly drain your account.
Monthly Maintenance
A fee just for having the account open. Usually $5–$15 per month.
Avoid: Keep a minimum balance.
Overdraft Fee
Charged when you spend more than you have. Can be $35 per occurrence!
Avoid: Set up alerts or link savings.
Out-of-Network ATM
Charged for using a different bank's ATM. Often $2.50 + the other bank's fee.
Avoid: Use your bank's app to find free ATMs.
Paper Statement Fee
Charging you $2–$5 just to mail you a paper copy of your balance.
Avoid: Go green! Use "Paperless Statements."
THE TWIN
TERRORS
Most people think they are the same, but the outcome is very different.
Overdraft
"The Bank Covers You"
The bank pays the merchant, but charges you a massive fee and expects the money back immediately.
Non-Sufficient Funds (NSF)
"The Transaction Fails"
The bank refuses to pay. You STILL get charged a fee by the bank AND potentially a fee by the store.
Decoding the "Fee Schedule"
1
The Daily Limit
"Limit of 4 overdraft fees per day."
Math check: 4 fees × $35 = $140 in one day!
2
The Waiver
"Fee waived with direct deposit of $500 or more."
Tip: If you have a job, this is your best friend!
Pro Tip: The "De Minimis" Threshold
Some banks won't charge a fee if you are overdrawn by less than $5. Check your bank's policy!
CHOOSE YOUR WEAPON
In a moment, you'll receive two bank "Fee Schedules." You must decide where your money is safest based on YOUR spending habits.
Analyze the Costs
Dodge the Traps
Fee Trap Case Study Activity Fee Trap Case Study
Mission: Identify the Hidden Drains
Name:
The Subject: Alex the Student
Weekly Habits
Uses out-of-network ATMs 3 times a month because they are closer to school.
Balance
Keeps a low balance (~$50). Occasionally forgets a small subscription and overdraws 2x a year.
Statement
Prefers paper statements in the mail to help stay organized.
Apex Global Bank
Monthly Maintenance $12.00
(Waived with $1,500 minimum balance)
Overdraft Fee $35.00
Out-of-Network ATM $0.00
(Apex pays all ATM surcharges!)
Paper Statement $0.00
Community Trust
Monthly Maintenance $0.00
(Always free checking!)
Overdraft Fee $20.00
Out-of-Network ATM $2.50
(Plus any third-party fees)
Paper Statement $5.00
The Annual Cost Battle
Fee Category Apex Global (Total / Yr) Community Trust (Total / Yr) Monthly Maintenance Overdraft Charges ATM Surcharges Paper Statements Total Annual Cost
Fighter's debrief
1. Based on Alex's habits, which bank is the clear winner? Why?
2. If Alex switched to "Paperless Statements" and only used in-network ATMs, how would the winner change?
3. Identify one "Hidden Trap" in the Apex Global schedule that Alex didn't fall into, but a different customer might. Explain.
Digital Dash Slides Lesson 3: Financial Control
DIGITAL
DASH
Mastering the tools of modern banking.
Banking in your Pocket
Gone are the days of driving to the bank for every little thing. Today, you have a 24/7 branch in your pocket.
The Mission:
Can you navigate a digital interface to pay a bill, deposit a check, and send money to a friend in under 60 seconds?
9:41
Total Balance
$1,240.50
Transfer
Bill Pay
Deposit
Alerts
Recent Transactions
The Digital Toolkit
Master these 4 pillars of online banking to manage your money like a pro.
Bill Pay
Set up one-time or recurring payments for rent, phone, or utilities. No checks required.
P2P Transfers
Zelle, Venmo, or internal transfers. Send money to friends or your own accounts instantly.
Mobile Deposit
Snap a photo of the front and back of a check to deposit it without leaving your house.
Push Alerts
Get notified instantly when your balance is low or when a large purchase is made.
THE POWER OF
THE ALERT
Alerts aren't just annoying notifications—they are your early warning system.
Catch fraud before it gets worse.
Avoid overdraft fees by knowing your limit.
Track your spending in real-time.
Settings
Low Balance Alert
Notify me when balance is below $25
Large Purchase Alert
Notify me for transactions over $100
Weekly Summary
Receive spending breakdown every Sunday
THE P2P
DANGER ZONE
Peer-to-Peer (P2P) transfers are IRREVERSIBLE. Once the money is sent, it's gone.
Confirm Identity
Always double-check the username or phone number.
Friends Only
Never use P2P for people you don't know personally.
READY TO DASH?
You are about to enter the banking app simulator. Your goal is to navigate the interface to complete a series of tasks as fast as possible.
Open Simulator
Review Manual
Digital Dash Navigation Guide Digital Dash Navigation
Mobile Banking Simulator Task List
Name:
Part 1: The Control Panel
Look at the mock interface on the board (or your device). Match the digital feature to its primary purpose.
Transfer (P2P)
Paying a friend back for lunch.
Mobile Deposit
Adding a birthday check to your balance.
Bill Pay
Setting up a monthly phone bill payment.
Alerts & Notifications
Getting a text when your balance is $10.
Part 2: Guarding Your Balance
Automated alerts are the best way to prevent Fees . Design your personal alert strategy below.
Low Balance Threshold
At what dollar amount should the bank text you to warn you of a low balance?
$
Fraud Prevention
For what purchase size should you receive an "unusual activity" alert?
$
Critical Thinking:
Why might a student set a Low Balance Alert at $50 instead of $0?
Part 3: The Danger Zone
"Once you hit send, it's gone."
Read the scenario: "A stranger on social media offers to sell you a limited edition sneaker for half price. They only accept payments through a P2P app."
Should you send the money? Why or why not?
Cyber Guard Slides Lesson 4: Cybersecurity
CYBER
GUARD
The art of defending your digital vault.
Encryption Active
Hacker vs. Customer
It takes an average hacker less than 1 second to crack a simple 8-character password.
The Challenge:
Can you build a defense that is strong enough to keep them out, but easy enough for you to remember?
>> BRUTE FORCE ATTACK INITIALIZED...
Trying: soccer123... [FAILED]
Trying: password!... [FAILED]
Trying: sunnyday... [FAILED]
Defense Level
CRITICAL VULNERABILITY
Complexity vs. Length
Why "correcthorsebatterystaple" is better than "Tr0ub4dur&3".
The "Old" Way
Mixing symbols and numbers into a short word. Computers are now extremely fast at guessing these patterns.
P@$$w0rd123!
The "Passphrase" Way
Multiple random words strung together. They are easy for humans to remember but mathematically impossible for computers to guess.
PurpleRobotTacoJump
THE SECOND
LOCK
Multi-Factor Authentication (MFA) means that even if a hacker gets your password, they STILL can't get in.
Something you HAVE
Your phone (SMS code or Authenticator App)
Something you ARE
FaceID, TouchID, or Biometrics
Something you KNOW
Your Password or PIN
Don't Take The Bait
Urgent Language
"Your account will be CLOSED in 24 hours if you don't click here!"
Suspicious Sender
Check the email domain. Is it @chase.com or @chase-security-dept.net?
Mismatched Links
Hover over the button. Does the address match where it says it's going?
"When in doubt, don't click. Go directly to the bank's official website or app."
THE PHISH FINDER
It's time to put your skills to the test. You've been sent 3 suspicious emails. Can you spot the red flags and keep your account safe?
START INVESTIGATION
Phishing Red Flag Detective Worksheet Phishing Detective
Cyber Guard Investigative Report
Investigator:
Mission Briefing
Three "official" emails have arrived in your inbox. One is legitimate; two are phishing attempts. Your goal is to identify the Red Flags and decide which actions are safe.
From: First National Security Dept security@bank-alert-verify.net
Subject: URGENT: ACCOUNT SUSPENSION NOTICE
Dear Valued Customer,
Our records indicate suspicious activity on your account. To prevent unauthorized access, we have temporarily suspended your online banking privileges. To restore access, you must verify your identity immediately by clicking the link below within 12 hours or your account will be permanently closed.
VERIFY ACCOUNT NOW
First National Bank | 123 Finance Way | NY, NY 10001
Red Flags Identified:
Urgent/Threatening Language
Suspicious Sender Email
Mismatched Link/URL
Verdict:
LEGITIMATE
PHISHING
From: Digital Dash Banking alerts@digitaldash.com
Subject: Monthly Spending Summary - October
Hello Alex,
Your monthly spending summary for October is now available for viewing. Log in to your secure Digital Dash portal to review your transactions and see where your money went this month.
VIEW MY SUMMARY
This is an automated notification. For your security, we will never ask for your password via email.
Red Flags Identified:
Urgent/Threatening Language
Suspicious Sender Email
Generic Greeting (no name)
Verdict:
LEGITIMATE
PHISHING
The Final Defense
1. You receive a text message from your bank asking you to "Press 1 to confirm a $450 purchase at Apple.com." You didn't buy anything. What is your NEXT step?
2. Rate these passwords (1-5 stars):
IloveSoccer123!
PencilOvenCloudLake
3. MFA Explanation:
In your own words, why does Multi-Factor Authentication make "phishing" much less dangerous for a bank customer?
Balance Master Slides Final Lesson: Mastery
BALANCE
MASTER
Where the math meets the money.
Account Reconciliation
The Missing $142
You think you have $500 for your vacation fund. The bank says you have $358. Your budget is broken .
"Is the bank wrong? Did I make a mistake? Is someone stealing from me?"
The Detective's Mission:
We must find every transaction, fee, and cent to make the numbers match perfectly. This is Reconciliation .
Operation: Balanced Ledger
The Definition
Reconciliation is the process of comparing your records with the bank's records to find and fix any differences.
Your Records
Your "Check Register" or App History. This tracks money the moment you spend it.
Bank Records
The monthly statement. This only tracks money once the bank processes it.
THE TIME
GAP
Differences usually happen because of things the bank doesn't know about yet.
Outstanding Checks
You wrote a check, but the person hasn't cashed it yet.
Deposits in Transit
You put money in, but it's still being processed.
The Mastery Equation
Bank Statement Balance
+ Deposits in Transit
- Outstanding Checks
Adjusted Balance
My Register Balance
- Bank Fees
+ Interest Earned
Adjusted Balance
Pro-Steps
1
Tick Off
Compare your register to the statement. Place a checkmark next to every transaction that matches.
2
Identify
Find the "Outstanding" items (the ones without a checkmark). These are your missing links.
3
Adjust
Apply the math to both sides. If they match, you're a Balance Master!
CHALLENGE ACCEPTED
Can you solve the mystery of the Statement Showdown and save the vacation fund?
LET'S RECONCILE
Statement Showdown Activity Statement Showdown
Mission: Balance the Vacation Fund
Name:
Your Check Register
Date Description Amt 10/01 Opening Balance $500.00 10/05 Pizza Shack (Ck #101) -$22.50 10/12 Deposit (Birthday) +$100.00 10/18 Movie Theater (Ck #102) -$15.00 10/22 Gas Station -$40.00 10/25 New Sneakers (Ck #103) -$85.00 10/28 Babysitting Pay +$60.00 Ending Balance $497.50
Bank Statement (Oct)
Date Description Amt 10/01 Beginning Balance $500.00 10/08 Check #101 -$22.50 10/13 Deposit (Mobile) +$100.00 10/24 Gas Station -$40.00 10/30 Service Fee -$5.00 10/31 Interest Earned +$0.25 Statement Balance $532.75
Step 1: The Audit
Compare the two lists. In the Check Register above, place a checkmark ✓ next to every transaction that appears in BOTH places.
Outstanding Items (In Register only):
Unrecorded Items (In Statement only):
Step 2: The Reconciliation
Adjust the Bank Balance
Ending Statement Balance: $532.75
+ Deposits in Transit
- Outstanding Checks
ADJUSTED BALANCE
Adjust Your Register
Ending Register Balance: $497.50
+ Interest Earned
- Bank Fees
ADJUSTED BALANCE
Mastery Reflection
