The sum of the exterior angles of a convex polygon Student activity Play

The sum of the exterior angles of a hexagon Whiteboard exercise Play

The sum of the exterior angles of a pendecagon Whiteboard exercise Play

The sum of the interior angles in the polygons Whiteboard exercise Play

The sum of the interior angles of a quadrilateral – proof Animation Play

The sum of vectors Animation Play

The sum to n consecutive positive integers Whiteboard exercise Play

The sum to n consecutive positive integers Whiteboard exercise Play

The sum to n terms of an arithmetic progression Student activity Play

The sum to n terms of an arithmetic progression – activities Student activity Play

The sum to n consecutive positive integers Student activity Play

The sum to n terms of an arithmetic progression Whiteboard exercise Play

The sum to n terms of an arithmetic progression – activitiy Whiteboard exercise Play

The tickets to the cinema Whiteboard exercise Play

The tickets to the ice ring Whiteboard exercise Play

The trapezium rule Student activity Play

The union of sets Student activity Play

The union of sets Whiteboard exercise Play

The value of the expression Whiteboard exercise Play

The values of the derivative of the sum Whiteboard exercise Play

The weight of Lena's purchases Animation Play

Theorem – assumptions and claim Student activity Play

Theorem – assumptions and claim Whiteboard exercise Play

Theorems and their assumptions in geometry Whiteboard exercise Play

Theorems and their assumptions in geometry Student activity Play