A simple trick Animation Play

Areas of various shapes Student activity Play

Divisibility by 3 and 9 Student activity Play

Jacob Bernoulli's clever trick Student activity Play

Jacob Bernoulli's clever trick Whiteboard exercise Play

More complicated problems Student activity Play

Simple trick in integration by substitution Animation Play

Triangle tricks Animation Play

Trick Whiteboard exercise Play

Trick Animation Play

Trick – explanation Animation Play

Using a trick Animation Play

Using a trick in finding roots Whiteboard exercise Play

Using a trick in finding roots Student activity Play