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4th Grade — Money & Business

Bank accounts, supply and demand, and pricing a real product.

Ages 9–10

The one idea

Prices aren't decided by the seller — they're decided by how many people want it and how much of it exists.

Nine and ten year olds are ready for a real bank account with their name on it. Supply and demand clicks this year if you show it with something they already collect.

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

The six 4th 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

Working for someone vs working for yourself

With a job, you get paid the same whether it's a busy day or a quiet one — safe, but capped. With your own thing, a bad week pays nothing and a great week pays a lot. Neither one is better; they're different trades.

Five weeks of Cara's bookmark money next to Nabil's paper round.
  • Week 1 — Cara$4
  • Week 2 — Cara$11
  • Week 3 — Cara$6
  • Week 4 — Cara$0

    Nothing at all that week

  • Week 5 — Cara$71

    School fair

  • Any week — Nabil$30

    Every single Saturday, guaranteed

Cara made $92 over those five weeks; Nabil made $150 and knew every number in advance. Different people should pick differently.

Do this

Draw two columns and list what's good and bad about each. Notice that the good things are opposites.

Say this

"Would you rather have $10 guaranteed, or a coin flip between $0 and $30? There's no right answer — but know which one you picked."

A story

The two paper rounds

Nabil delivered papers for the shop and got $30 every Saturday, rain or shine, busy or quiet. His friend Cara made and sold custom bookmarks. One week Cara made $4. The week before the school fair she made $71. Over the whole term they earned almost exactly the same amount, and neither of them would have swapped.

Which one had the better deal?

Neither. Nabil bought certainty and gave up the good weeks. Cara kept the good weeks and gave up knowing what Saturday would bring. That is a trade, not a ranking.

The usual mistake

Teaching that working for yourself is obviously better. It is not obviously anything — it is a different risk, and plenty of people should not take it.

The fix

Make them name what each side gives up. The good things about a job and a business are exact opposites of each other.

🏦 Save

Your own bank account

A bank keeps your money safer than a jar, pays you a little interest, and shows you a number that goes up. The trade is that you can't see it or touch it, which makes spending it feel less real.

$140 in a shoebox, or $140 in an account.

The shoebox

$140

You can see it. Which is exactly why it keeps getting smaller.

✓ Better deal

Account in her name

$140 + interest

Harder to reach, safer, and it grows a little on its own.

The friction is not a downside. Money that is slightly annoying to spend is money that survives the month.

Do this

Open a real children's savings account, in their name, and let them make the first deposit at the counter.

Say this

"This account has your name on it. Nobody takes money out of it but you."

A story

The account with her name on it

Zoë had $140 in a shoebox. Her mum took her to the bank and she filled in the form and handed the money over herself. It felt awful — she walked out with nothing in her hands. Then the first statement arrived addressed to Miss Z. Adeyemi, and she read it about nine times.

What did Zoë give up, and what did she get?

She gave up seeing and touching it, which genuinely makes spending harder — that is a feature. She got safety, a little interest, and a number with her name on it.

The usual mistake

Opening the account for them while they're at school. The signing, the counter, and the first statement are the entire lesson.

The fix

They fill in the form. They hand over the money. They open the letter. You are the lift.

🛒 Spend

Price per unit

The big box isn't always cheaper. Divide the price by how much you're actually getting, and compare those numbers instead. Shops rely on you not doing this.

Two boxes of the same cereal. Price per 100g is the only number that compares.

Giant box — 1,200g for $6.24

52¢ / 100g

Looks like the bargain. Costs the most per gram.

✓ Better deal

Medium box — 500g for $2.20

44¢ / 100g

On offer this week. Actually the cheapest.

Never compare the price on the front. It is a price for a different amount of stuff.

Do this

In one supermarket aisle, work out the price per 100g for three sizes of the same product. Find which is really cheapest.

Say this

"Don't compare the prices — compare price per 100g. Which one is actually cheaper?"

A story

The bigger box that wasn't cheaper

In the cereal aisle Amir's dad handed him a calculator and asked him to find the best value. Amir assumed it would be the giant box, because it always is. It wasn't. The medium box on offer that week worked out at 44¢ per 100g and the giant one was 52¢. He checked it twice because he didn't believe it.

Why do shops make the big one look like the bargain?

Because almost nobody divides. "Bigger is cheaper" is a habit shops can rely on, and relying on it is worth real money to them.

The usual mistake

Comparing the prices on the front. They are for different amounts, so they cannot be compared at all.

The fix

Divide price by weight and compare those. Most supermarkets print it in tiny grey text on the shelf label — find it once and they'll always look.

💝 Give

Where the money actually goes

Charities aren't all the same. Some send most of your donation to the people who need it; some spend a lot on running themselves. Checking before you give makes your money do more.

Priya's $50, at each charity's actual rate.
  • Charity A — reaches the work$44

    About 87¢ of every dollar

  • Charity B — reaches the work$31

    About 62¢ of every dollar

Same $50, same cause, $13 difference. Ten minutes of looking was worth $13.

Do this

Look up two charities doing similar work and find how much of each dollar reaches the cause.

Say this

"Both do good work. But which one turns more of your dollar into actual help?"

A story

Two charities, same cause, different maths

Priya wanted to donate $50 to help with clean water and found two organisations doing almost identical work. She looked up how each one spent its money. One turned about 87¢ of every dollar into actual projects; the other turned about 62¢. She sent all $50 to the first one, which meant roughly $12 more reaching the work for no extra money at all.

Was the second charity bad?

Not necessarily — some run expensive work that needs staff. But Priya got $12 more of impact for the same $50 just by spending ten minutes looking.

The usual mistake

Giving to whoever asks first, or loudest. The organisations best at asking are not automatically the best at delivering.

The fix

Ten minutes, two organisations, one question: how much of each dollar reaches the work? Then give it all to one.

📈 Grow

Supply and demand

When lots of people want something and there isn't much of it, the price goes up. When there's loads of it and nobody's interested, the price falls. That's it — that's the whole rule behind most prices you see.

Four cards from the same set, printed the same day.
  • Common — 50,000 printed$2

    Everyone already has three

  • Uncommon — 8,000 printed$12

    Wanted about as much, far fewer around

  • Rare — 900 printed$60

    Same want, much smaller supply

  • Rare and in the winning deck$200

    Small supply and a spike in demand

Same paper, same ink, same day. Price is the gap between how much exists and how much people want.

Do this

Look at something they collect. Find the rarest one and the most common one, and compare what people pay.

Say this

"Why is that one worth more? Is it better — or is it just rarer?"

A story

Why the same card is worth $2 or $200

Two cards from the same set sat side by side in Jae's binder. They were printed on the same paper on the same day. One was worth about $2 and one was worth about $200. The expensive one wasn't better in the game — it was just printed in far smaller numbers, and everyone in his year wanted one.

What makes the second card worth a hundred times more?

Two things at once: how few there are, and how many people want one. Change either number and the price moves. Nothing about the card itself has to change at all.

The usual mistake

Thinking price measures quality. It measures the gap between how much exists and how much people want.

The fix

Whenever a price is surprising, ask both halves out loud: how rare is it, and how many people want it right now?

🧠 Mindset

Getting told no

Every person who sells anything hears no far more often than yes. The ones who succeed aren't the ones who avoid no — they're the ones who ask enough times that the yeses add up.

Tomas's week, counted properly.
  • People asked16
  • Said no10
  • Said yes6

He controlled the top number. The bottom one turned up on its own — it always does, at some rate.

Do this

Set a target of collecting ten noes this week. Chasing noes flips the fear on its head.

Say this

"How many noes did you get today? Good — that means you actually asked."

A story

The week Tomas went looking for noes

Tomas hated asking people for anything, so his sister set him a target: collect ten noes this week selling his origami. He got the first no in about four minutes and it stung. By the fourth he was almost enjoying it. He never reached ten — he ran out of week — because along the way six people said yes.

Why did chasing noes work better than chasing yeses?

Because a no now counts as progress instead of failure. You can't control who says yes. You can completely control how many times you ask.

The usual mistake

Measuring the week by sales. On a bad week that reads as "I am bad at this", and the asking stops.

The fix

Set the target as asks or noes — something entirely inside their control. The yeses turn up as a side effect.

The 4th Grade Money Check

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

0/8
  1. 1

    What's the trade-off with a regular job?

  2. 2

    Why does a bank pay you interest?

  3. 3

    $4 for 500g or $3 for 300g — which is cheaper per 100g?

  4. 4

    Two charities do similar work. What's worth checking?

  5. 5

    Everyone wants a card and only 50 exist. What happens to its price?

  6. 6

    A card is common and nobody wants it. Its price is…

  7. 7

    You asked 10 people to buy and 9 said no. What does that mean?

  8. 8

    You made $40 selling and spent $25 on supplies. What's your profit?

What would you do?

Three situations a 4th grade child really does run into. There is no silly option here — every one of them is something a reasonable person would pick.

1

A 1,200g box of cereal is $6.24. A 500g box of the same cereal is on offer at $2.20.

2

You're offered a paper round at $30 every Saturday, or you can keep running your own bookmark stall where weeks range from $0 to $71.

3

You have $50 to donate. Two charities do nearly identical clean water work. One turns 87¢ of every dollar into projects, the other 62¢.

Work it out

0/4 checked

Real 4th grade money maths. Work it out first — the button shows how it was done, not just the answer.

  1. 1

    A 750g bag costs $4.50. What is the price per 100g?

  2. 2

    Cara made $4, $11, $6, $0 and $71 over five weeks. Nabil made $30 every week. Who made more, and by how much?

  3. 3

    You donate $50 to a charity that turns 87¢ of every dollar into projects. How much reaches the work?

  4. 4

    You have $140 in an account paying 3% a year. How much interest after one year, and after two?

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.

$
25% · $1.75/week

$91 a year → $910 after 10 years

35% · $2.45/week

$127 a year → $1,274 after 10 years

10% · $0.70/week

$36 a year → $364 after 10 years

30% · $2.10/week

$109 a year → $1,614 after 10 years

Look ahead:

You put in

$3,640

You end up with

$4,162

Grew on its own

+$522

That extra $522 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 $7 a week, ideally paid into the bank account rather than as cash. The grow share is now big enough to fund a real product batch.

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 4th grade child would explain them — not the way a bank would.

Supply
How much of something exists to buy.
Like: Only 50 of that card were ever printed.
Demand
How many people want it.
Like: Everyone at school wants that card.
Deposit
Money you put into a bank account.
Like: Paying in $20 of birthday money.
Withdraw
Money you take out of a bank account.
Like: Taking $5 out for the school trip.
Unit price
What it costs per gram, per litre, or per one.
Like: $4 for 500g is 80¢ per 100g.
Revenue
All the money that came in, before costs.
Like: 40 cups at $1 is $40 revenue.
📜 This actually happened

The year a tulip bulb cost more than a house

In Holland in the 1630s, tulips had just arrived from the east and rich collectors went mad for the rarest patterned bulbs. Prices climbed for years, ordinary people started trading bulbs they never intended to plant, and at the peak in February 1637 a single bulb could change hands for more than a skilled worker earned in a decade. Then, in a few weeks, buyers stopped turning up and the prices collapsed almost to nothing.

The bulbs never changed. What changed was how many people wanted one — and demand can vanish faster than it arrives.

This week's mission

The Rarity Investigation

Supply and demand stops being a definition and becomes something they've watched happen.

⏱️ 45 minutesSomething they collect — cards, stickers, game itemsPaper
  1. 1Pick five items from the collection and write them in a list.
  2. 2Next to each, note how many exist or how easy they are to find.
  3. 3Next to that, note how many people they know who want it.
  4. 4Now write what each one actually trades for.
  5. 5Find the pattern — and then find the one item that breaks it, and work out why.
🚀 Starter business

The Priced-Properly Product

"I make this, and here's exactly why it costs what it costs."

What it costs to start

$10–20 in materials

What to charge

Cost per unit, then multiply by three. One-third materials, one-third your time, one-third profit.

  1. 1Make ten of something people actually buy — friendship bracelets, keyrings, baked goods.
  2. 2Add up total materials and divide by ten. That's your cost per unit.
  3. 3Set the price at roughly three times that, and write down the reasoning.
  4. 4Sell five at that price. Watch how quickly they go.
  5. 5If they sold out fast, raise the price for the next batch — that's demand talking.

The business lesson underneath

Selling out instantly means you priced too low. Fast sell-out is information, not just success.

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"What's the price per 100g?" Hand them your phone in the supermarket and let them settle an argument.
  • 2"Is that expensive because it's better, or because it's rare?" Ask about something they collect.
  • 3"Would you take $30 guaranteed or a coin flip between $0 and $70?" There's no right answer — just find out which one they are.
  • 4"How many people did you ask this week?" Not how many said yes.

Three habits that matter at this age

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

Let them run the account

Their own deposits, their own balance checks, their own withdrawal decisions. Supervised, but not done for them.

Reframe rejection as data

Count noes out loud. A child who tracks rejections stops fearing them, and that single reframe outlasts every money lesson here.

Always divide before comparing

Unit price, per-serving cost, cost per use. Comparing totals is how shops win; comparing units is how you do.

By the end of 4th Grade

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

  • Operates their own savings account, including deposits and balance checks
  • Calculates unit price and uses it to compare options
  • Explains supply and demand with a real example from their own life
  • Prices a product from materials cost rather than guessing
  • Distinguishes revenue from profit without prompting
  • Keeps asking after several rejections

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 4th Grade packs cover the whole year across maths, reading and writing, and study skills.

4th Grade Packs

← Younger

3rd Grade

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5th Grade

See all 12 grades

Frequently Asked Questions

What should a 4th Grade child understand about money?

Prices aren't decided by the seller — they're decided by how many people want it and how much of it exists. Concretely: operates their own savings account, including deposits and balance checks; calculates unit price and uses it to compare options; explains supply and demand with a real example from their own life. 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 4th Grade child get?

Around $7 a week is a reasonable starting point at ages 9–10. About $7 a week, ideally paid into the bank account rather than as cash. The grow share is now big enough to fund a real product batch. The calculator on this page lets you try different amounts and splits.

What business can a 4th Grade child actually run?

The Priced-Properly Product: "I make this, and here's exactly why it costs what it costs." Startup cost is $10–20 in materials. Selling out instantly means you priced too low. Fast sell-out is information, not just success.

What is the most common money mistake 4th Grade children make?

Teaching that working for yourself is obviously better. It is not obviously anything — it is a different risk, and plenty of people should not take it. Make them name what each side gives up. The good things about a job and a business are exact opposites of each other. Each of the six lessons on this page names the trap for its own pillar and the smallest change that fixes it.

Is the 4th 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 4th 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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