The content of a problem as an algebraic expression Animation Play

The content of a problem as an algebraic expression Student activity Play

The fence problem Whiteboard exercise Play

The fence problem Student activity Play

The hidden assumptions Animation Play

The investment – a more difficult problem Student activity Play

The problem of de Méré Animation Play

The problem of drug addiction Student activity Play

The problem of drug addiction Whiteboard exercise Play

The scatter plot for bird density Student activity Play

The tangent theorem – solving problems Whiteboard exercise Play

Theorem – assumptions and claim Student activity Play

Theorem – assumptions and claim Whiteboard exercise Play

Theorems and their assumptions in algebra Student activity Play

Theorems and their assumptions in algebra Whiteboard exercise Play

Theorems and their assumptions in geometry Whiteboard exercise Play

Theorems and their assumptions in geometry Student activity Play

Time – a more difficult problem Student activity Play

Time – a more difficult problem Whiteboard exercise Play

Two points of view on the same problem Whiteboard exercise Play

Two points of view on the same problem Student activity Play