A different way of calculating the mean Animation Play

A different way of numbering groups in the periodic table Animation Play

A liquid exerts pressure in a different way from a solid Whiteboard exercise Play

A liquid exerts pressure in a different way from a solid Student activity Play

A more difficult problem Whiteboard exercise Play

A more difficult problem Student activity Play

A simpler way to write algebraic expressions Student activity Play

Arrangement of different objects Animation Play

Arrangement of indistinguishable objects Animation Play

Arrangements Student activity Play

Arrangements in a ring Student activity Play

Arrangements in a ring Animation Play

Arrangements in a ring – three men and two women Whiteboard exercise Play

Arrangements in boxes Student activity Play

Arrangements – ten explorers Whiteboard exercise Play

Balls in boxes Student activity Play

Choosing shoes Whiteboard exercise Play

Choosing the suits Whiteboard exercise Play

Coloured balls Whiteboard exercise Play

Coloured balls Student activity Play

Combinations Student activity Play

Different ways of proving Animation Play

Different ways of proving – example as a proof Whiteboard exercise Play

Drawing one ball Animation Play

Example as a proof Student activity Play