I have also tried to take the students step by step through any calculations they need to do. Of course, it has not been possible in these modules to cover every last aspect of the topics they contain. In addition to the learning objectives, there are always the objectives that the teacher needs to bear in mind. Here are a few ideas that should help you to answer this question. Firstly, you should see these modules as an additional resource that can help you out in a few ways, including.
Textbooks are fine, the television and radio is fine as an additional resource.
Case studies and past examination questions are also fine and so is project work. They are new and contain aspects of the topics that some students might find challenging and that they can go over again and again. When the student works through any of the calculations, the spreadsheet has been programmed to tell them whether their answer is right or wrong. Working through these modules can at least give you some ideas here. Cutting and pasting from here to there can be a boon for you and your students.