A right-angled triangle Student activity Play

A right-angled triangle – adjacent side Whiteboard exercise Play

A right-angled triangle – opposite side Whiteboard exercise Play

A river Simulation Play

A rough guess Animation Play

A round table Whiteboard exercise Play

A Russian matchmaker Animation Play

A sample of students Whiteboard exercise Play

A sample of three letters Whiteboard exercise Play

A savings account in a bank Animation Play

A scale Student activity Play

A scale Whiteboard exercise Play

A scatter diagram Student activity Play

A scatter diagram Whiteboard exercise Play

A segment and a position vector of its midpoint Simulation Play

A segment square root of 2 units long and others Animation Play

A sequence Animation Play

A sequence – matchsticks Whiteboard exercise Play

A series of experiments Student activity Play

A series of experiments Whiteboard exercise Play

A shortcut Animation Play

A simple case Student activity Play

A simple case of definite integral Whiteboard exercise Play

A simple identity Student activity Play

A simple trick Animation Play