

Topic: Number and Algebra
Level: IB Mathematics: Applications and Interpretation (SL)
File Type: Editable Slides / Worksheet
Overview
This resource introduces Geometric Sequences, a core concept in IB Math AI SL Topic 1.3.
It helps students identify geometric patterns, calculate terms and sums of geometric series, and apply these ideas to real-world problems involving exponential growth and decay.
Students will learn to determine whether a sequence is geometric, find the nth term, and calculate the sum of a finite geometric series. The lesson also explores practical applications through a comparative problem involving arithmetic and geometric patterns.
Learning Objectives
By the end of this lesson, students will be able to:
- Identify geometric sequences by determining a constant ratio between consecutive terms.
- Find the nth term of a geometric sequence using the general formula.
- Calculate the sum of n terms for a finite geometric series.
- Recognize the difference between arithmetic and geometric growth.
- Apply geometric models to real-world contexts such as training schedules or financial growth.
What’s Included
- Definition and equation of a geometric sequence with guided examples.
- Practice problem using the sequence 2, 6, 18 to verify geometric behavior.
- Step-by-step derivation and application of formulas for nth term and sum of n terms.
- Worked example involving Andrew and Steven’s marathon training, combining arithmetic and geometric reasoning.
- Integration of GDC (Graphical Display Calculator) for solving inequalities visually.
Topics Covered
- Definition of geometric sequences and common ratio ®.
- Formula for the nth term of a geometric sequence.
- Derivation and use of the sum of a finite geometric series.
- Distinguishing arithmetic vs. geometric progressions.
- Real-world application problem involving comparative growth.
- Use of technology (GDC) to model and solve problems.
Why You’ll Love It
- Clear and visually consistent formatting aligned with IB Math AI SL standards.
- Conceptual explanations paired with practical applications.
- Engaging word problems that reinforce pattern recognition and algebraic manipulation.
- Smooth progression from definitions to multi-step problem solving.
- Ideal for classroom instruction, guided practice, or exam preparation.
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