1.16 Harder HCF and LCM IGCSE PowerPoint Lesson

In this 31-slide lesson, pupils will deepen their understanding of Highest Common Factor (HCF) and Lowest Common Multiple (LCM) through complex, non-routine problems that require reasoning with prime factorisation. Instead of relying on Venn diagrams, students will be expected to interpret and manipulate the product of primes directly to find HCFs and LCMs. The focus will be on developing logical fluency and structured problem-solving techniques. These more challenging styles of questions are commonly seen on IGCSE papers.

Note this is lesson four, out of four on factors, multiples, primes.

The lesson includes:

• Clear, guided examples

• Discussion opportunities from Think, Pair, Share

• Mini whiteboard section to check understanding and clarify misconceptions

• Three structured tasks to practise key skills

• Challenge activity to extend and deepen learning

Perfect for engaging learners while reinforcing essential numeracy concepts.