A stationary source and a mobile observer Student activity Play

Absolute pitch Animation Play

An ear for music and absolute pitch Simulation Play

An ear for music and absolute pitch Student activity Play

Audible frequency ranges Student activity Play

Completing the perfect square Whiteboard exercise Play

Completing the perfect square Student activity Play

Day and night Student activity Play

Factorisation is not always possible! Student activity Play

Factorisation of polynomials Class activity Play

Factorisation of polynomials Whiteboard presentation Play

Factorising by completing the square Student activity Play

Factorising perfect square trinomials Whiteboard exercise Play

Factorising perfect square trinomials Whiteboard exercise Play

Factorising perfect square trinomials Student activity Play

Factorising perfect square trinomials – common factor first Whiteboard exercise Play

Factorising perfect square trinomials – common factor first! Student activity Play

Finding perfect squares in quadratic equations Whiteboard exercise Play

Finding perfect squares in quadratic equations Student activity Play

Hearing Class activity Play

Kinds of relationship Whiteboard exercise Play

Kinds of relationship Student activity Play

More factorisation Whiteboard presentation Play

More factorisation Class activity Play

Oscillations of strings in a guitar Animation Play