A prove it is when you have learnt something and are ready to show you have learnt it. You make a poster or a mini movie showing what you have been learning and how to do it, this is a 'Prove it'. Once you have gone to a teacher, showed it to them and they have approved, they will sign you off on your learning passport. A learning passport is a sheet with all the learning intentions on it if you go to a workshop with a teacher the sign a square next to your learning intention to show you have been to a workshop. This is a photo of one.
My learning intention was to divide using proportional adjustment. Here is a photo of my prove it.