A short introduction task to using algebra tiles for the distributive law. I have refrained from suggesting this task is about “expanding brackets”. Instead, the task can be used with that focus or for factorisation using a common factor. I like to introduce both ideas within close proximity – a real manifestation of ‘interleaving’. A key theme in mathematics is doing and undoing. Considering both the doing and undoing process in close proximity can help pupils to develop deeper understanding of both and how they are linked.