The study of factors and multiples is not a new topic for GCSE, it starts from Key Stage 2 and continues all the way as part of studying Numbers in GCSE. The application of finding factors is when simplifying fractions and LCM is used to find a common denominator when adding/subtracting fractions.
Ahad has over 10 years of experience teaching Maths and Engineering. He has a post-graduate certification learning and teaching in higher education and qualified to a PhD level in Engineering. He has had several activities in promoting STEM-related subjects and teaching maths is a personal interest.