Support understanding of how to calculate the value of one unknown angle in a triangle by using this resource.

This Year 6 Angles in a Triangle (One Unknown Angle) Varied Fluency worksheet helps children use the knowledge that all angles in a triangle add to 180 degrees to calculate the value of one missing angle. Children will identify the type of angle missing from triangles, calculate the value of one unknown angle with a representation to help and finally calculate one unknown angle with no image. All answers are also included so that marking is as easy as possible!

A reasoning and problem solving resource and fluency matrix are also available for this small step.