Class: Junior Secondary School 3 (JSS3, JSS 3)
Term: 2nd Term
Week: 2
Age: 14 years
Duration: 45 minutes
Subject: Mathematics
Curriculum Theme: Mathematics
Previous Lesson: Changing the Subject of a
Topic: Compound Interest
Subject Matter: Revision of simple interest, Solving problems on compound interest, Applying the use of compound interest in daily life activities…

Specific Objectives

By the end of the lesson, pupils should be able to:

Cognitive Domain:
(a) Define compound interest clearly.
(b) Solve numerical problems involving compound interest for one or more years.
Affective Domain:
(a) Show appreciation for the use of compound interest in banking and savings.
(b) Demonstrate a positive attitude towards personal financial responsibility.
Psychomotor Domain:
(a) Accurately use formulas to compute compound interest.
(b) Perform step-by-step calculations using calculators where necessary.
Social Domain:
(a) Work cooperatively in pairs or groups to solve compound interest problems.
(b) Communicate findings and solutions clearly with peers.

Reference Materials

The following resources was used in planning this lesson:

9 Years Basic Education Curriculum
Lagos State Unified Scheme of Work for Junior Secondary Schools
Investopedia – Compound Interest Definition (https://www.investopedia.com/terms/c/compoundinterest.asp)
Corporate Finance Institute – Understanding Compound Interest (https://corporatefinanceinstitute.com/resources/wealth-management/compound-interest/)
Relevant Textbooks

Instructional Materials

The teacher will teach this lesson with the aid of:

Chart showing simple and compound interest differences
Sample bank savings booklet
Calculator
Whiteboard and markers
Flash cards showing formulas
Real-life interest rate examples from banks

Rationale for the Lesson

Understanding compound interest helps learners develop financial literacy and make informed decisions about savings, loans, and investments.

Prerequisite/Previous Knowledge

Pupils already understand simple interest, basic percentage calculations, and have experience with real-life money transactions in markets and savings.

Lesson Content/Board Summary

Lesson Content

Compound Interest

Meaning of Compound Interest

Compound interest is the interest calculated on both the principal and the accumulated interest from previous periods. It increases the amount faster than simple interest because interest is added to the principal after each time period.

The following are the key ideas about compound interest:

It is calculated on the principal and previous interest.
It grows faster than simple interest.
It is commonly used in banks, loans, and investments.

Formula for Compound Interest

Compound interest is calculated using a formula that helps determine the amount accrued over a period of years.

The following are the formulas used in compound interest:

Amount (A) = ( P(1 + frac{R}{100})^T )
Compound Interest (CI) = A – P
P = Principal, R = Rate (%), T = Time (years)

Steps in Calculating Compound Interest

Solving compound interest problems involves clear steps to determine the amount and the interest earned.

These include:

Identify the principal, rate, and time.
Substitute into the formula for amount.
Calculate the final amount.
Subtract the principal from the amount to get compound interest.

Applications of Compound Interest in Daily Life

Compound interest is applied in various financial activities that people engage in regularly.

Examples include:

Savings account growth in banks.
Loans and repayment schedules.
Investment plans such as fixed deposits.
Business capital growth calculations.

Teaching Methods/Instructional Techniques:

Discussion, Lecture, Explanation, Demonstration, Guided Practice, Group Work, Questioning

Instructional Procedures

To deliver this lesson, the teacher will adopt the following steps:

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher tells a short story about a student who saved money in a bank and noticed it increased beyond the expected amount.
Pupils’ Activity: Pupils listen and respond to the teacher’s questions.
Learning Point: Pupils become curious about how money grows through compound interest.

Step 2: Meaning of Compound Interest

Time: 8 minutes
Teaching Skill: Explanation
Teacher’s Activity: The teacher defines compound interest and explains how it differs from simple interest.
Pupils’ Activity: Pupils listen and ask questions for clarity.
Learning Point: Pupils understand compound interest as interest on principal and accumulated interest.

Step 3: Formula for Compound Interest

Time: 10 minutes
Teaching Skill: Demonstration
Teacher’s Activity: The teacher writes and explains the formulas for amount and compound interest, showing how each variable is used.
Pupils’ Activity: Pupils note the formulas and follow the explanation.
Learning Point: Pupils know and can identify each part of the compound interest formula.

Step 4: Solving Compound Interest Problems

Time: 12 minutes
Teaching Skill: Guided Practice
Teacher’s Activity: The teacher solves sample compound interest problems and guides pupils through additional practice questions.
Pupils’ Activity: Pupils solve similar problems individually or in pairs.
Learning Point: Pupils apply the formula to accurately calculate compound interest.

Step 5: Note-Taking

Time: 3 minutes
Teaching Skill: Writing Skill
Teacher’s Activity: The teacher instructs pupils to copy the board summary into their notes.
Pupils’ Activity: Pupils write notes neatly.
Learning Point: Pupils organise correct notes for revision.

Step 6: Evaluation/Review

Time: 5 minutes
Teaching Skill: Questioning
Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

Define compound interest.
State the compound interest formula.
List two applications of compound interest.
Solve a short compound interest problem.
Pupils’ Activity: Pupils answer the questions individually.
Learning Point: Pupils demonstrate understanding of the lesson.

Step 7: Conclusion

Time: 2 minutes
Teaching Skill: Reinforcement
Teacher’s Activity: The teacher summarises the lesson and emphasises the importance of compound interest in savings and investments.
Pupils’ Activity: Pupils listen attentively.
Learning Point: Pupils recall the key points of the lesson.

Lesson Keywords

Principal – The original amount of money invested or borrowed.
Rate – The percentage at which interest is calculated.
Amount – The total value after interest is added.
Interest – Extra money added to the principal.
Compound – Accumulation of previous interest added to the principal.

Differentiation

Provide simplified problems for slower learners and advanced multi-year calculations for fast learners; use peer support and visual aids where necessary.

Note for teachers using this lesson plan

Encourage learners to relate compound interest to personal savings. Use real bank examples to improve understanding and maintain steady pacing to ensure full participation.