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How Interest Works

Sixth graders dig into interest — the extra money you earn by saving or pay by borrowing. They learn simple vs compound interest, why saving early pays off, and why borrowing always costs more than you took out.

Grade 6How Interest Works50 minutes1 class periodEconomics · C3Explicit teaching4 StandardsC3 / NSPFE
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Lesson at a Glance

Everything you need before the bell rings

Learning Objectives

Students will be able to…

  • ✓Explain interest.
  • ✓Compare simple & compound.
  • ✓See why early saving wins.
  • ✓Understand borrowing cost.
Essential Question

Interest can grow your savings — or grow what you owe. How does it work, and why does starting early matter?

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Lesson Phases
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Vocabulary Terms
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Standards Aligned
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Interactive Task
Explore · Interactive

The Interest Explorer

Project this and tap each. Have students learn how interest works.

🌱 Explore how interest works — tap eachTry it

The Lesson · Inquiry Flow (Hook · Explore · Practice · Apply · Reflect)

50 minutes, five moves

Tap any phase to open the teacher moves and student actions.

1

Hook — Money That Grows

5 min

Interest can grow your savings — or what you owe — how does it work?

👩‍🏫 Teacher Moves

  • Show $100 growing.
  • Ask where the extra came from.
  • Set the goal.

🎒 Student Actions

  • Look.
  • Wonder.
  • Get ready.
2

Explore — How Interest Works

12 min

Students explore.

👩‍🏫 Teacher Moves

  • Send students to the Interest Explorer.
  • Note simple vs compound.
  • Note early saving wins.

🎒 Student Actions

  • Tap each.
  • Note it.
  • Note it.
3

Practice — Practice

13 min

Students practice.

👩‍🏫 Teacher Moves

  • Explain compound interest.
  • Compare two savers.
  • Explain borrowing cost.

🎒 Student Actions

  • Explain.
  • Compare.
  • Explain.
4

Apply — Apply

11 min

Students apply.

👩‍🏫 Teacher Moves

  • Estimate savings after a year.
  • Compare starting early vs late.
  • Share your finding.

🎒 Student Actions

  • Estimate.
  • Compare.
  • Share.
5

Reflect — Reflect

5 min

Students close.

👩‍🏫 Teacher Moves

  • Say what interest is.
  • Explain compound interest.
  • Complete the exit ticket.

🎒 Student Actions

  • Say it.
  • Explain it.
  • Complete the exit ticket.
Standards Alignment

Built to the standards you report on

Aligned to the C3 Framework (Economics) & the National Standards for Personal Financial Education.

NSPFE
Saving & Investing

Explain interest & growth.

C3
D2.Eco.1.6-8

Explain financial growth.

C3
D2.Eco.2.6-8

Explain incentives to save.

NSPFE
Credit & Debt

Understand borrowing cost.

Differentiation

One lesson, every learner

Multilingual Learners

ELL / EMERGING READERS
  • Interest concept cards.
  • Sentence frame: “Interest is ___.”
  • Use a growth chart.

Support & Access

IEP / 504
  • Start with “extra money for saving.”
  • Use one example.
  • Discuss one idea.

Stretch & Extend

GIFTED / EARLY FINISHERS
  • Chart compound growth.
  • Compare simple vs compound.
  • Explain the rule of 72.
Materials

What to gather

  • 📽️Screen / board
  • 🌱A growth chart
  • 💻The Interest Explorer
  • 📊A savings calculator
  • ✏️Notebooks
  • 🎫Exit-ticket slips
Vocabulary

Key terms — hover for a quick definition

interestextra money earned or paidsimple interestonly on the starting amountcompound interestinterest on your interestprincipalthe starting amountratethe percent of interestgrowget bigger over timeborrowuse money you must repayearngain money by saving
Evaluate

Exit Ticket

Preview the three formative checks. Tap “Sample answer” to see what mastery looks like — hide them before you print for students.

QUESTION 1
What is interest?
Extra money you earn when you save — or pay when you borrow.
QUESTION 2
What is compound interest?
Interest earned on your interest, so money grows faster.
QUESTION 3
Why does saving early help?
Your money has more time to grow.

Reflect: how interest works.

Have students explain why compound interest makes money grow faster over time. A printable interest sheet is in the Social Studies library.

Study · Flashcards

Study the key terms

Tap a card to flip it, then rate whether you knew it. Built from this lesson’s vocabulary.

🃏 How Interest WorksFlip
Card 1
Term
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Meaning
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Practice · Quiz

Check your understanding

A quick self-check with instant feedback, drawn from this lesson’s key terms.

📝 How Interest WorksQuiz
Score: 0
1 / 6
Question 1
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Practice · Worksheet

Printable worksheet

A print-and-go review sheet with a built-in answer key. Tap “Show answer key” to reveal answers, or print the clean version for students.

🖨️ How Interest WorksPrint
Name: ________________________
Date: ____________

Part A · Write the word that matches each meaning

Word bank: borrow, compound interest, earn, grow, interest, principal, rate, simple interest
  1. get bigger over time
  2. use money you must repay
  3. only on the starting amount
  4. the percent of interest
  5. interest on your interest
  6. the starting amount
  7. extra money earned or paid
  8. gain money by saving

Part B · Show what you learned

  1. What is interest?
  2. What is compound interest?
  3. Why does saving early help?
Answer key — Part A: 1) grow · 2) borrow · 3) simple interest · 4) rate · 5) compound interest · 6) principal · 7) interest · 8) earn
Part B: 1) Extra money you earn when you save — or pay when you borrow. 2) Interest earned on your interest, so money grows faster. 3) Your money has more time to grow.