Thanks for the explanation and clarification, Robbie.

Guest. I can't remember my teachers being specially worried whether we showed every step or not. We were warned though that it was in our own interests to show our workings. If say a question was worth 5 marks, a right answer would get 5 marks but a wrong answer with no working would get 0 marks. If the workings showed most of the steps right (eg, carrying through an error made in the first step), at least some marks could be awarded.