The state equation Animation Play

The sum and difference of trigonometric functions Whiteboard exercise Play

The Superb Sandwich Company Animation Play

The tangent – reducing angles Student activity Play

The tangent – reducing angles Whiteboard exercise Play

The test-point method Student activity Play

The trigonometric functions of the angle 90° Animation Play

The unknown on both sides of the equation Whiteboard exercise Play

The unknown on both sides of the equation Student activity Play

The unknown on one side of the equation Whiteboard exercise Play

The unknown on one side of the equation Student activity Play

The unknown on one side of the equation – more difficult problems Student activity Play

The unknowns Whiteboard exercise Play

The value of the number m Whiteboard exercise Play

The values of the trigonometric functions Animation Play

The vector equation of a line Animation Play

The weight of one lemon Animation Play

Theorems and their assumptions in algebra Whiteboard exercise Play

Theorems and their assumptions in algebra Student activity Play

Theorems and their assumptions in geometry Student activity Play

Thermal resistance Animation Play

Thermal resistance Student activity Play

Thermal resistance Animation Play

Thermal resistance Whiteboard exercise Play

Think of a number Whiteboard exercise Play