Arithmetic mean – the 'true' value of the data Whiteboard exercise Play

Arithmetic mean – the 'true' value of the data Student activity Play

Counterexamples Whiteboard exercise Play

Counterexamples and proofs Whiteboard exercise Play

Counterexamples and proofs Student activity Play

Eubacteria – true bacteria Student activity Play

Eubacteria – true bacteria Whiteboard exercise Play

How to distinguish between a true solution, a colloid and a suspension Animation Play

Median and the 'true value' of measurements Whiteboard exercise Play

Median and the 'true value' of measurements Student activity Play

Roots of roots – finding true equations Whiteboard exercise Play

Roots of roots – more examples of true or false equations Whiteboard exercise Play

System of linear equations and their solutions Student activity Play

True and false conditions Whiteboard exercise Play

True or false? Animation Play

True tissues Student activity Play

True tissues Slideshow Play

True tissues – cross section Simulation Play

Types of reasoning Animation Play

Types of reasoning I Student activity Play

Types of reasoning II Student activity Play

When is a theorem true? Whiteboard exercise Play

When is a theorem true? The proof Student activity Play