Class: Senior Secondary School 1 (SS1 / SSS 1)
Term: Third Term
Week: 4
Age: 15 years
Duration: 45 minutes
Subject: Book Keeping
Curriculum Theme: Trade
Previous Lesson: Trial Balance: Extracting Balances from Ledger and Preparation of Trial Balance.
Topic: Corrections of errors
Subject Matter: Meaning of errors, Types of errors, Errors affecting trial balance

Specific Objectives

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

Cognitive Domain:

Define errors in book-keeping.
Identify different types of errors in accounting.
State errors that affect the trial balance.
Explain the nature of each type of error.

Affective Domain:

Appreciate the importance of correcting errors promptly for accurate financial records.
Show interest in learning how to identify and rectify errors.
Recognize the impact of uncorrected errors on financial statements.

Psychomotor Domain:

Correct simple errors in ledger accounts.
Prepare basic journal entries to rectify errors.

Participate in group discussions on error identification.
Collaborate with peers to solve error correction problems.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum for Book Keeping.
State Unified Scheme of Work for Senior Secondary Schools.
Simplified Book Keeping and Accounts for Senior Secondary Schools by A. L. Okere.
https://www.accaglobal.com/gb/en/student/exam-support-resources/fundamentals-exams-study-resources/f3/technical-articles/errors-suspense.html
https://www.accountingcoach.com/bookkeeping/errors

Instructional Materials

The teacher will teach this lesson with the aid of:

A chart showing different types of errors.
A chart illustrating the concept of a suspense account.
Ledger account formats on the board.
Whiteboard/chalkboard and markers/chalk.

Rationale for the Lesson

Understanding corrections of errors helps pupils to ensure that financial records are accurate and reliable. It enables them to identify and fix mistakes in accounts, which is important for making correct financial decisions and presenting true financial performance.

Prerequisite/Previous Knowledge

Pupils should have knowledge of basic accounting principles, double-entry system, ledger postings, and the preparation of a trial balance.

Lesson Content/Board Summary

Corrections of Errors

Meaning of Errors in Book Keeping

Errors in book-keeping refer to mistakes made during the recording of financial transactions. These mistakes can occur at any stage of the accounting process, from journal entries to ledger postings and preparation of the trial balance. Identifying and correcting these errors is essential for accurate financial reporting.

Types of Errors in Book Keeping

Errors in book-keeping can be classified into different types. Some errors affect the trial balance, while others do not. The following are types of errors:

Error of Omission: This occurs when a transaction is completely left out of the books of accounts. For example, failing to record a cash sale.
Error of Commission: This occurs when a transaction is incorrectly recorded in the books. This could be recording it in the wrong account of the same class, or with the wrong amount, or on the wrong side. For example, debiting a customer’s account instead of another customer’s account, or posting N5,000 as N500.
Error of Principle: This occurs when a transaction is recorded contrary to fundamental accounting principles. For example, treating a capital expenditure (like buying a machine) as a revenue expenditure (like paying for repairs).
Compensating Error: This occurs when two or more errors cancel each other out, so that their net effect on the debits and credits is zero. For example, an over-debit of one account is cancelled out by an over-credit of another account of the same amount.
Error of Original Entry: This occurs when the initial amount recorded in the journal is incorrect. If the original entry is wrong, all subsequent postings will also be wrong, but the double entry itself will be balanced. For example, an invoice of N1,000 is incorrectly entered into the sales journal as N100.
Complete Reversal of Entries: This occurs when the correct accounts are used, but the debit and credit entries are made on the wrong sides. For example, debiting Cash and crediting Sales instead of debiting Sales and crediting Cash for a cash purchase.

Errors Affecting the Trial Balance

These are errors that cause the total debits and total credits of the trial balance to disagree. Such errors lead to the creation of a suspense account. The following are errors that affect the trial balance:

Single Entry Error: This occurs when only one side of a double entry is posted, or an entry is posted twice on one side. For example, debiting an account without a corresponding credit.
Transposition Error: This occurs when the order of digits in an amount is reversed. For example, writing N540 instead of N450.
Error in Casting (Addition): This occurs when the columns of a ledger account or the trial balance are incorrectly added up.
Error in Balancing Accounts: This occurs when the balance of a ledger account is incorrectly calculated.
Posting to the Wrong Side of an Account: For example, posting a debit entry as a credit entry in a ledger account.
Omission of an Account Balance from the Trial Balance: This occurs when the balance of a particular ledger account is completely left out when preparing the trial balance.

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher greets the pupils and reviews the previous lesson on Trial Balance. The teacher then asks questions like, “What happens if there are mistakes in our accounting records?” and “Why is it important for financial records to be accurate?”.
Pupils’ Activity: Pupils respond to the questions and recall previous knowledge.
Learning Point: Pupils are prepared for the new topic and understand the need for accurate records.

Step 2: Presentation of Subject Matter

Time: 5 minutes
Teaching Skill: Explanation
Teacher’s Activity: The teacher introduces the topic “Corrections of Errors” and writes it on the board. The teacher states the specific objectives for the lesson.
Pupils’ Activity: Pupils listen attentively and copy the topic into their notebooks.
Learning Point: Pupils know the topic and what they are expected to learn.

Step 3: Explanation of Meaning of Errors

Time: 5 minutes
Teaching Skill: Explanation
Teacher’s Activity: The teacher explains what errors in book-keeping mean, giving simple examples of how mistakes can occur during recording transactions.
Pupils’ Activity: Pupils listen, ask questions for clarity, and take notes.
Learning Point: Pupils understand the definition of errors in book-keeping.

Step 4: Discussion on Types of Errors

Time: 10 minutes
Teaching Skill: Explanation/Illustration
Teacher’s Activity: The teacher discusses the different types of errors (omission, commission, principle, compensating, original entry, complete reversal). The teacher explains each type with clear examples, using the chart where necessary.
Pupils’ Activity: Pupils listen, observe the chart, ask questions, and contribute examples.
Learning Point: Pupils can identify and explain various types of errors.

Step 5: Explanation of Errors Affecting Trial Balance

Time: 10 minutes
Teaching Skill: Explanation/Demonstration
Teacher’s Activity: The teacher explains errors that cause the trial balance to disagree, such as single entry error, transposition error, error in casting, and omission of an account balance. The teacher explains why these errors lead to a suspense account.
Pupils’ Activity: Pupils listen, take notes, and ask questions.
Learning Point: Pupils understand which errors affect the trial balance and why.

Step 6: Class Activity/Practice

Time: 5 minutes
Teaching Skill: Practical Application
Teacher’s Activity: The teacher gives a short problem where pupils identify the type of error from a given scenario. For example: “A purchase of N2,000 was completely omitted from the books. What type of error is this?”
Pupils’ Activity: Pupils discuss in pairs and provide answers.
Learning Point: Pupils practice identifying different error types.

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

Define errors in book-keeping.
Mention three types of errors that do not affect the trial balance.
State two errors that will cause the trial balance to disagree.
Explain what is meant by an error of principle.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 5 minutes
Teaching Skill: Summarization
Teacher’s Activity: The teacher summarizes the key points of the lesson, emphasizing the importance of correcting errors for accurate financial records. The teacher then assigns homework, asking pupils to find examples of each error type from a textbook.
Pupils’ Activity: Pupils listen to the summary and copy down the homework assignment.
Learning Point: Pupils consolidate their learning and prepare for further study.

Lesson Keywords

Error – A mistake in recording financial transactions.
Omission – Completely leaving out a transaction.
Commission – Recording a transaction incorrectly in amount or account.
Principle – Recording a transaction contrary to accounting rules.
Original entry – An error in the initial recording of a transaction.
Reversal – Debiting and crediting the wrong sides of accounts.
Compensating – Two or more errors cancelling each other out.
Transposition – Reversing the order of digits in an amount.
Trial Balance – A list of all ledger balances to check arithmetic accuracy.
Suspense Account – A temporary account used to balance the trial balance when errors are found.

Differentiation

The teacher will provide additional support to pupils who are struggling by using simplified examples and one-on-one explanations. Advanced pupils will be given more complex scenarios for error identification and correction to challenge their understanding.

Note for teachers using this lesson plan

Teachers should ensure they have practical examples ready for each type of error to make the explanations clearer. Encourage active participation and questions from pupils. It is helpful to use ledger account formats on the board to demonstrate how errors might look before and after correction.