Go through the powerpoint on duration of time as many times as you need to. Take your time to familiarise yourself with the skill to work out duration. When you are feeling more confident, you can complete the tasks on the sheet below. There are 3 challenges. You could either choose one challenge (choose wisely!) or get maximum practise by completing all 3 challenges . Remember, if you do not have access to a printer, you write out the calculations and complete them in your home learning book.