| Lesson Plan |
| Grade: |
Date: 25/02/2026 |
| Subject: Additional Mathematics |
| Lesson Topic: Use the general term in the binomial expansion to find a specified term or to solve related problems |
Learning Objective/s:
- Describe the general‑term formula for a binomial expansion.
- Apply the formula to locate a specified term or coefficient.
- Solve problems that require finding a term containing a given power of a variable.
- Identify and avoid common errors such as index confusion and sign mistakes.
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Materials Needed:
- Whiteboard and markers
- Projector with slides
- Printed worksheet with practice questions
- Calculator (optional)
- Prepared example cards
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Introduction:
Begin with a quick mental recall of the Binomial Theorem, then pose a real‑world question about expanding (2x‑3)^5 to capture interest. Review that students already know how to compute binomial coefficients. State that by the end of the lesson they will be able to write the r‑th term and use it to find any required term or coefficient.
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Lesson Structure:
- Do‑now (5’) – Short quiz on binomial coefficients written on the board.
- Teacher mini‑lecture (10’) – Review the Binomial Theorem and derive the general r‑th term formula, emphasizing the r‑1 index.
- Guided practice (15’) – Work through Example 1 and Example 2 together, identifying a, b, n and solving for r.
- Independent practice (15’) – Students attempt the five practice questions, recording steps in their notebooks while the teacher circulates.
- Check for understanding (5’) – Whole‑class poll (clickers) to confirm each step of the method.
- Summary & reflection (5’) – Review the four‑step procedure and discuss common pitfalls.
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Conclusion:
Summarise the four‑step method for locating a term and remind students to verify the range of r and the sign of b. Ask each pupil to write an exit‑ticket stating the r‑th term for a given expansion. Assign a worksheet of additional binomial‑term problems for homework.
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