Counterexamples Whiteboard exercise Play

Counterexamples and proofs Student activity Play

Counterexamples and proofs 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

Types of reasoning Animation Play

Types of reasoning I Student activity Play

Types of reasoning II Student activity Play

When is a theorem false? Animation Play

When is a theorem false? The counterexample Student activity Play