2.54 Introduction to Functions Higher IGCSE PowerPoint Lesson

In this 26-slide lesson, students will be introduced to the concept of functions, learning how to evaluate them through substitution and understand the relationship between inputs (domain) and outputs (range). They will explore function notation such as f(x), practise finding outputs for given inputs, and begin identifying appropriate values for the domain and range. Through discussion, students will consider which values should be excluded from a domain—for example, values that cause division by zero or square roots of negative numbers. This foundational lesson prepares students for further work on composite and inverse functions by establishing a clear understanding of how functions behave and how to interpret their notation.

This lesson is for the higher tier only.

The lesson includes:

• Clear, guided examples

• Discussion opportunities from Think, Pair, Share

• Mini whiteboard section to check understanding and clarify misconceptions

• Two structured tasks to practise key skills

• Challenge activity to extend and deepen learning

Perfect for engaging learners while reinforcing essential algebra concepts.