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10th Grade — Money & Business

Student loans, real budgets, building assets, and launching something real.

Ages 15–16

The one idea

Assets pay you while you sleep; liabilities charge you while you sleep. Everything you buy is one or the other.

Fifteen and sixteen year olds are within a couple of years of decisions worth tens of thousands. This is the last easy window to run the numbers together.

📚 The 6 lessons🧠 Money check🤔 What would you do?🧮 Work it out🫙 Allowance calculator

The six 10th Grade money lessons

One per pillar. Each has what to teach, a ten-minute thing to do, and the exact words you can say — so you can start right now without preparing anything.

💼 Earn

Several income streams

One income is one point of failure. A job, plus a skill you sell, plus something you own that pays — that's three. You don't need them to be equal; you need them not to fail at the same time.

Yara's income today, and what survives if the biggest one stops.
  • Main job$2,400

    Gone in one email, once before

  • Freelance work$700

    Survives losing the job

  • Something she owns$180

    Pays whether she works or not

Losing the job takes 73% of her income and leaves 27%. Before, it took 100%.

Do this

Map their current and possible income sources. Identify which could survive losing the main one.

Say this

"If your main income vanished tomorrow, what's left? That answer is your actual risk."

A story

The week Yara's only income stopped

Yara had one client who paid well and covered everything. When they restructured and cancelled, her income went to zero in a single email. It took her four months to rebuild. She now keeps a job, a freelance skill, and a small thing she owns that pays a little — not because the mix is optimal, but because no single email can end all three.

Was Yara badly paid or badly structured?

Well paid and badly structured. One income is not a small risk — it is a single point of failure with your rent attached to it.

The usual mistake

Confusing a big income with a safe one. The best-paid single client is still one client.

The fix

Count your income sources, not your income. Then ask which of them would survive losing the biggest one.

🏦 Save

Student loans and what they really cost

$30,000 borrowed at 6% over ten years costs around $40,000 to repay. The degree may well be worth it — but you should know both numbers before signing, not after.

$30,000 borrowed at 6%, repaid over ten years.
  • Amount borrowed$30,000
  • Interest over 10 years$9,970
  • Total actually repaid$39,970

$333 a month for 120 months. Whether the degree is worth $40,000 is a fair question — worth $30,000 was never the question.

Do this

Run a real loan calculator: total repaid, monthly payment, and total interest for a realistic amount.

Say this

"You borrow $30,000 and repay about $40,000. What does the extra $10,000 buy you? Is the degree worth it anyway?"

A story

$30,000, and the number nobody mentioned

Before signing, Rafi ran the loan through a calculator: $30,000 at 6% over ten years. The monthly payment was $333. The total repaid was about $40,000. He signed anyway — his course genuinely required the degree — but he signed knowing the number was $40,000 and not $30,000.

Did the calculator change his decision?

No, and it did not need to. It changed what he was agreeing to, from a vague large number into $333 every month for ten years — which is a thing you can actually picture.

The usual mistake

Comparing course prices instead of total repayments. The interest is invisible at the point of signing and is the part you feel for a decade.

The fix

Run every loan through a real calculator: monthly payment, total repaid, total interest. Do it before signing, not after.

🛒 Spend

A budget with real bills in it

Rent, food, transport, phone, insurance, savings. Run a real one for a month using local prices, before anyone is depending on you getting it right.

Noor's first real monthly budget, before she fixed it.
  • Take-home pay$2,500
  • Rent$1,250
  • Food$400
  • Transport$250
  • Phone and insurance$200
  • Savings — non-negotiable$300
  • Utilities and everything else$280
  • Short every month−$180

Rent is half of take-home, which is where the problem is. Fix the biggest line or nothing else will fit.

Do this

Build a full monthly budget using actual rents and prices in your area, on a realistic starting salary.

Say this

"That's a real salary and those are real rents. Does it balance? What has to give?"

A story

The budget that didn't balance

Before moving out, Noor built a real budget using actual local rents and a realistic starting salary. It came out $180 short every month. Nothing in it was extravagant. She found the $180 by moving one neighbourhood out and taking a flatmate — a decision that was easy in a spreadsheet and would have been miserable in a crisis three months into a lease.

What did the spreadsheet actually buy her?

The chance to make a boring decision calmly instead of an urgent one badly. Every budget that doesn't balance balances eventually — the only question is whether you chose how.

The usual mistake

Building the budget after signing the lease. By then the biggest number in it is fixed for a year.

The fix

Build it with real local rents before you look at flats. Rent is the number that decides all the others.

💝 Give

Deciding what you're for

Adults who give consistently decided what they cared about early and stopped rethinking it. Pick the thing, set the percentage, and let it run for decades.

The same 5%, as Ola's income changed over twenty years.
  • At 17 — 5% of $4,000$200

    Trivial. And the habit started.

  • At 25 — 5% of $34,000$1,700
  • At 37 — 5% of $86,000$4,300

    She has never had to decide again

She made one decision at seventeen. The percentage did the rest as her income grew.

Do this

Write one paragraph on the cause you'd fund for the next ten years, and the percentage you'll commit.

Say this

"What problem would you want less of in the world? Start there, and start now while it's small."

A story

The thing Ola decided at seventeen

Ola wrote one paragraph at seventeen about what she wanted less of in the world, picked a percentage, and set it up. She has changed jobs four times, moved countries twice, and given every month since. Nothing about it has ever needed rethinking, which is the entire reason it survived.

Why does deciding early matter so much?

Because generosity that gets re-decided every year loses to whatever else is happening that year. Decide once, set the percentage, and let the decision outlive your moods.

The usual mistake

Waiting until you have enough to give properly. Nobody ever reaches that point, because the amount required rises with income.

The fix

Pick the cause and the percentage now, at whatever your income is. The habit is the part that is hard to start later.

📈 Grow

Assets versus liabilities

An asset puts money in your pocket. A liability takes it out. A car you drive is a liability; a car you rent out is an asset. The same object can be either — what matters is which direction the money flows.

Does it put money in your pocket, or take it out?
Puts money inIndex fundA room yourent outKit you hireoutA book thatsellsTakes money outCar onfinanceGuitar younever playDaily coffeeDesignerlabel

The same object can sit in either column. Which column it lands in is a decision, not a property of the thing.

Do this

List ten things people buy. Sort them into assets and liabilities, and argue about the ambiguous ones.

Say this

"Does this put money in your pocket or take it out? That's the only question."

A story

Same car, two directions

Two people on Kofi's street bought the identical car for $12,000. One drives it to work and pays about $3,400 a year to keep it on the road. The other drives it to work and rents it out at weekends, which brings in about $4,600 a year. Same object, same street, same year — one of them is being paid by their car and one is paying for theirs.

Is a car an asset or a liability?

Neither, until you know which way the money flows. It is not the thing that decides — it is what you do with it.

The usual mistake

Sorting by the object. "A house is an asset" is false if it costs you more each month than it brings in.

The fix

Ask one question of everything you own: does this put money in my pocket or take it out? That is the whole test.

🧠 Mindset

Launching something real

Every skill on this page is theory until you sell something to a stranger. Do it once — properly, with real numbers — and everything above stops being abstract.

Sana's thirty days, counted honestly.
  • 11 maps sold at $8$88
  • Printing and materials$54
  • What she made$34

$34 for a month's work is a terrible hourly rate and a completed first sale to a stranger. Only one of those is rare.

Do this

Set a 30-day deadline. Ship something. Charge for it. Write down what actually happened versus what you expected.

Say this

"Thirty days. What can you actually get into someone's hands and get paid for?"

A story

Thirty days, one stranger

Sana gave herself thirty days to sell something to somebody she had never met. She made a small print run of local walking maps, priced them at $8, and sold eleven — mostly to people in a café who had no reason to be nice to her. She made $34 after costs. She said afterwards that everything she had read about business had been theory until the fourth stranger handed over $8.

Was $34 worth thirty days?

The $34 was not the product. The thing she now knows — that strangers will pay her for something she made — is not available from any amount of reading.

The usual mistake

Selling to friends and family. They buy because they know you, which tells you nothing about whether the thing is any good.

The fix

The test is a stranger with no reason to be kind. One sale to one of those is worth twenty to people who love you.

The 10th Grade Money Check

8 questions. You get the reasoning either way — being wrong is where the learning is.

0/8
  1. 1

    Borrow $30,000 at 6% over 10 years. Roughly what do you repay?

  2. 2

    Which is an asset?

  3. 3

    You own $5,000 and owe $2,000. Net worth?

  4. 4

    Why build more than one income stream?

  5. 5

    Income $2,000, expenses $1,700. Monthly cash flow?

  6. 6

    When should you decide what cause you support?

  7. 7

    What turns all of this from theory into skill?

  8. 8

    A budget on a real salary doesn't balance. What's the right response?

What would you do?

Three situations a 10th grade child really does run into. There is no silly option here — every one of them is something a reasonable person would pick.

1

You're offered a job paying more than everything you currently earn combined, from one employer.

2

You've built a monthly budget with real local rents and it comes out $180 short.

3

You've read everything about business and you're waiting until the idea is properly ready before selling anything.

Work it out

0/4 checked

Real 10th grade money maths. Work it out first — the button shows how it was done, not just the answer.

  1. 1

    $30,000 borrowed at 6% over 10 years costs about $333/month. What's the total repaid, and the interest?

  2. 2

    Take-home is $2,500 and rent is $1,250. What percentage of your income is rent, and is that sustainable?

  3. 3

    A $12,000 car costs $3,400 a year to run and earns $4,600 a year hired out at weekends. Asset or liability?

  4. 4

    You sell 11 items at $8 with $54 of costs. What did you make, and what's your profit per unit?

The Four Jars

Move the sliders and watch what each jar becomes. Only the Grow jar is invested, so only Grow compounds — that is the whole reason the numbers separate.

$
15% · $4.50/week

$234 a year → $2,340 after 10 years

30% · $9.00/week

$468 a year → $4,680 after 10 years

10% · $3.00/week

$156 a year → $1,560 after 10 years

45% · $13.50/week

$702 a year → $10,378 after 10 years

Look ahead:

You put in

$15,600

You end up with

$18,958

Grew on its own

+$3,358

That extra $3,358 is money nobody worked for. It came from the Grow jar earning 7% a year on a balance that keeps getting bigger.

For parents: About $30 a week, or nothing at all if they're earning. By now the goal is a genuine budget with real obligations, not pocket money.

The 7% is a rough long-run stock market average used for illustration. Real returns vary, some years are negative, and nothing here is investment advice.

The words they need this year

Defined the way a 10th grade child would explain them — not the way a bank would.

Asset
Something you own that puts money in your pocket.
Like: Shares, a rented-out room, a product that keeps selling.
Liability
Something that takes money out of your pocket.
Like: A car loan, a credit balance, a subscription.
Net worth
What you own minus what you owe.
Like: $5,000 saved and $2,000 owed is $3,000.
APR
The true yearly cost of borrowing, including fees.
Like: 6% APR on a student loan.
Cash flow
Money in minus money out, each month.
Like: $2,000 in, $1,700 out, $300 positive.
Equity
The share of something you actually own.
Like: Owning 40% of a small business.
📜 This actually happened

$5,000, no investors, and 100% of the company

Sara Blakely started Spanx in 2000 with $5,000 of her own savings while still selling fax machines during the day. She wrote her own patent application from a textbook rather than pay a law firm, did her own packaging design, and never took outside investment. Because she never sold a share, she still owned the entire company when she sold a majority stake in 2021 in a deal that valued it at $1.2 billion.

The $5,000 is not the interesting number. Owning all of it for twenty-one years is — ownership, not salary, is what turns a business into wealth.

This week's mission

The Real Life Budget

They find out whether the life they're imagining actually fits the salary they're imagining.

⏱️ 2 hoursInternet accessA spreadsheet
  1. 1Pick a job you might realistically have at 22 and find its actual starting salary.
  2. 2Convert gross to net using real tax rates for your country.
  3. 3Look up real rents in the area you'd want to live.
  4. 4Add food, transport, phone, insurance, and 15% savings.
  5. 5Subtract. If it's negative, change something — and write down what you chose to change.
🚀 Starter business

The Thirty-Day Launch

"I built it, I sold it, and here are the real numbers."

What it costs to start

Whatever cap you set — most good first launches are under $100

What to charge

Charge from day one. Free users teach you almost nothing about whether it works.

  1. 1Pick one idea and set a hard 30-day deadline. Write the date down.
  2. 2Week one: talk to ten potential customers before building anything.
  3. 3Week two: build the smallest version that solves the problem.
  4. 4Week three: sell it. To strangers, for real money.
  5. 5Week four: write up revenue, costs, profit, and the single biggest thing you got wrong.

The business lesson underneath

A deadline turns an idea into a product. Without a date, the idea stays an idea indefinitely.

Four questions to ask this week

No printing, no materials, no lesson. Ask one at dinner and let the answer go wherever it goes — most of what children learn about money they overhear.

  • 1"If your main income stopped tomorrow, what's left?" Say the actual percentage out loud.
  • 2"Does this put money in your pocket or take it out?" Go round the room and do ten things.
  • 3"What's the total repaid, not the amount borrowed?" Ask it about any loan anyone mentions.
  • 4"What would you sell to a stranger in the next thirty days?" Then put a date on it.

Three habits that matter at this age

The money lessons only stick if these are running underneath them.

Sort every purchase: asset or liability

Ask which direction the money flows. Applied consistently over decades, this single question does most of the work.

Run the numbers before signing anything

Loans, leases, contracts. Total cost, monthly cost, and total interest — before the signature, not after.

Give every project a deadline

Ideas without dates don't ship. A date is the difference between something you did and something you meant to do.

By the end of 10th Grade

Tick these off through the year. If one is still open in June, that's the lesson to go back to.

  • Calculates the total repayment cost of a realistic loan
  • Sorts purchases into assets and liabilities correctly
  • Builds a full monthly budget on a real net salary and real local prices
  • Calculates net worth and monthly cash flow
  • Has more than one source of income
  • Has launched something real and knows its actual profit

Want the written practice too?

Everything on this page is free and always will be. If you want structured worksheets to go alongside it, the 10th Grade packs cover the whole year across maths, reading and writing, and study skills.

10th Grade Packs

← Younger

9th Grade

See all 12 grades

Frequently Asked Questions

What should a 10th Grade child understand about money?

Assets pay you while you sleep; liabilities charge you while you sleep. Everything you buy is one or the other. Concretely: calculates the total repayment cost of a realistic loan; sorts purchases into assets and liabilities correctly; builds a full monthly budget on a real net salary and real local prices. The six lessons on this page cover each of those, and the money check tells you which ones have landed.

How much allowance should a 10th Grade child get?

Around $30 a week is a reasonable starting point at ages 15–16. About $30 a week, or nothing at all if they're earning. By now the goal is a genuine budget with real obligations, not pocket money. The calculator on this page lets you try different amounts and splits.

What business can a 10th Grade child actually run?

The Thirty-Day Launch: "I built it, I sold it, and here are the real numbers." Startup cost is whatever cap you set — most good first launches are under $100. A deadline turns an idea into a product. Without a date, the idea stays an idea indefinitely.

What is the most common money mistake 10th Grade children make?

Confusing a big income with a safe one. The best-paid single client is still one client. Count your income sources, not your income. Then ask which of them would survive losing the biggest one. Each of the six lessons on this page names the trap for its own pillar and the smallest change that fixes it.

Is the 10th Grade money content on this page free?

Yes — all 6 lessons and their pictures, the 8-question check, the 6 stories, the 3 decision cards, the 4 worked money sums, the questions to ask at dinner, the vocabulary, the mission, the starter business, the allowance calculator, and the milestones are free with no signup. The 10th Grade printable packs in the shop are optional.

Does this work for a child who cannot read yet?

Every lesson on this page has a picture as well as words, so a younger sibling can follow along. If your child is not reading independently yet, start at the Pre-K or Kindergarten page instead — those are built to be spoken and pointed at.

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