A part of a centimetre Whiteboard exercise Play

An example of a proof Student activity Play

Application of the principle of conservation of mechanical energy Student activity Play

Application of the principle of conservation of mechanical energy Simulation Play

Application of the principle of conservation of mechanical energy Whiteboard exercise Play

Congruent = Identical Student activity Play

Congruent objects Animation Play

Determination of the acidic properties of ethanol Animation Play

Do alcohols have acidic properties? Student activity Play

Fraction of a fraction Student activity Play

Fraction of a fraction Simulation Play

Moving the arrow Whiteboard exercise Play

Operations on sets Whiteboard exercise Play

Operations on sets – exercises Student activity Play

Properties of a set Whiteboard exercise Play

Shoes completing Animation Play

The assumptions and the claim of the theorem Whiteboard exercise Play

The concept of a set Student activity Play

The counterexample Whiteboard exercise Play

Translation Student activity Play

What is a fraction? Student activity Play

What is a translation? Animation Play

When is a theorem false? The counterexample Student activity Play

When is a theorem true? Whiteboard exercise Play

When is a theorem true? The proof Student activity Play