Use this Year 4 Calculate Perimeter of Irregular Polygons Varied Fluency resource to help your class become confident when finding the perimeter of irregular shapes.

The worksheet begins with a question to check that children can identify regular and irregular polygons correctly. They then move onto finding the perimeter of an irregular polygon with one line of symmetry and a missing measurement. Finally, they are presented with an irregular polygon with one line of symmetry and several missing measurements. Can they find the measurements when they know the perimeter?

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

A reasoning and problem solving resource is also available for this small step.