This complete, ready-to-use lesson, “Diagon Alley - Numeracy,” takes primary pupils on an engaging, numeracy-focused journey through the magical world of Diagon Alley from the Harry Potter series. It combines elements of storytelling with practical numeracy exercises, immersing pupils in problem-solving related to potion-making and wizarding shop items. The activities require pupils to apply their skills in addition, subtraction, multiplication, and division as they work with fantasy currency (Galleons, Sickles, and Knuts) and manage shopping lists for potion ingredients and magical items. By integrating these elements, the lesson is designed to enhance both numeracy skills and imaginative thinking, providing a unique context that aligns with pupils’ interests. This lesson is ideal for teachers looking to add an interactive, fantasy-based approach to their teaching, encouraging active participation and a fun, memorable learning experience for pupils.