1.27 Percentage Increase and Decrease GCSE PowerPoint Lesson

In this 33-slide lesson, students will learn how to increase or decrease an amount by a given percentage using mental strategies and written arithmetic, rather than relying on percentage multipliers. The focus will be on developing a strong conceptual understanding of percentages as parts of a whole, and applying this to real-world contexts.

Students will:

• Calculate a percentage of a given amount (e.g. 10%, 25%, 15%)

• Add or subtract this percentage value to find the increased or decreased total

Note this is 3 out of 9 lessons on percentages.

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 numeracy concepts.