This Year 6 Measure and Classify Angles Teaching PowerPoint is an excellent tool to use as part of your whole-class teaching when consolidating children's understanding of angles and how to measure them.
 

With a clear teaching sequence to follow, this resource revisits the different types of angles before moving on to looking at why estimating is important when measuring. The learning then moves on to recap how we use a protractor to measure, focussing on using the correct scale.