Use this Year 4 Calculate Perimeter of Irregular Polygons Reasoning and Problem Solving resource to give your class problem solving practice related to finding the perimeter of irregular shapes.

The worksheet begins with a reasoning question which checks that children can identify regular and irregular polygons correctly. The second question, which has multiple answers, ensures that they understand how to work out the perimeter. In the final question, they are introduced to the idea of symmetry and how it can be useful when calculating the perimeter.

There are two similar parts to each question to promote confidence and an answer sheet is provided for teachers and pupils who are marking their own work.

A varied fluency resource is also available for this small step.