On 26 September 2023, we hosted an NRICH Live event for teachers of Year 6 to Year 9 students (aged 10 to 14).
During the event, we introduced a new task, Xavi's T-shirt, which offers an engaging context in which to search for patterns, gain insights into the structure of numbers, and lay the foundations for an appreciation of the prime factorisation of numbers.
Here is a recording of the webinar: