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

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

Multiplication of integers Student activity Play

Multiplication of integers Whiteboard exercise Play