Most of these are straightforward and rely on you understanding the relevant dose abbreviations and how to multiply, usually by 28! If you are stuck, think how you would work this out if you were in your pharmacy.

1 tds x 28 = 84

In the registration assessment, the questions will be harder than this or you need to do something else as well.

Such as:
Prednisolone 30 mg daily for 10 days and then reduce by 5mg every third day until at 0 mg. How many tablets do you need?

You may want to draw out a table but you would also need to remember that they are 5 mg tablets