A decomposition of integers Whiteboard exercise Play

A genealogical tree Animation Play

Adding a side to a polygon Animation Play

Algebraic transformations Animation Play

An example of a proof Student activity Play

Analysing the assumptions of a theorem Animation Play

Building a demonstration from a proof Whiteboard exercise Play

Building a demonstration from a proof Student activity Play

Building a proof Student activity Play

Building a proof Whiteboard exercise Play

Building a proof from a demonstration Whiteboard exercise Play

Building a proof from a demonstration Student activity Play

Building a proof from deductions Whiteboard exercise Play

Building a proof from deductions Student activity Play

Checking divisibility by 11 Whiteboard exercise Play

Compose a proof Student activity Play

Compose a proof Whiteboard exercise Play

Compose a proof Whiteboard exercise Play

Compose a proof Student activity Play

Congruent triangles Simulation Play

Congruent triangles Animation Play

Congruent triangles Student activity Play

Constructing a proof from a demonstration Student activity Play

Constructing a proof from a demonstration Whiteboard exercise Play

Counterexamples Whiteboard exercise Play

Counterexamples and proofs Whiteboard exercise Play

Counterexamples and proofs Student activity Play

Deduction Whiteboard exercise Play

Deduction Student activity Play

Deductions for algebraic transformations Student activity Play