Two aspects of angle are important in Year 5. One is being able to measure angles using a protractor. Before children begin to measure angles using a protractor it is very important that they are able to recognise types of angles, especially less than 90 degrees, more than 90 degrees and more than 180 degrees.
Once having done a rough estimate of an angle it is much easier to read the correct number of degrees on the protractor. Watch out in particular for children who read the scale on the protractor the wrong way round, for example, thinking that a 120 degree angle is 60 degrees.
Secondly, as well as measuring angles children will begin to calculate them, especially angles on a straight line and round a point. They will also learn the sum of the angles of a triangle and begin to work out the angles of a quadrilateral.
We have some great pages to help with all of this.