Divisibility by 3 and 9 Student activity Play

Divisibility by 7 Student activity Play

Divisibility by 7 Whiteboard exercise Play

Divisibility by 8 Whiteboard exercise Play

Divisibility by 8 Student activity Play

Division with remainder Student activity Play

Division with remainder – positive numbers Whiteboard exercise Play

Equal numbers Whiteboard exercise Play

Example of proof Animation Play

Forming words Student activity Play

Forming words Whiteboard exercise Play

Forming words – a password in a game Whiteboard exercise Play

How do we write algebraic expressions? Student activity Play

How many are there? Animation Play

How many are there? A more difficult problem Student activity Play

How to write a number without too many zeros Student activity Play

Is it a square? Student activity Play

Is it a square? Whiteboard exercise Play

Large numbers Student activity Play

Lattice method Animation Play

Listing elementary events Student activity Play

Listing elementary events – the PIN number Whiteboard exercise Play

Long division Animation Play

Long division by an integer divisor Student activity Play

Mental calculations Student activity Play