How many were there? Whiteboard exercise Play

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

How many? (1) Student activity Play

Is the number divisible by? Animation Play

Necessity of assumptions Whiteboard exercise Play

Necessity of assumptions Student activity Play

Numbers divisible by 10 Whiteboard exercise Play

Some properties of division Student activity Play

Some properties of division – a factor of a sum Animation Play

The assumptions and the claim of the theorem Whiteboard exercise Play

The divisibility by 7 test Animation Play

Theorems and their assumptions in algebra Whiteboard exercise Play

Theorems and their assumptions in algebra Student activity Play

Theorems and their assumptions in geometry Student activity Play

Trick – explanation Animation Play

Using the remainder theorem Student activity Play

What is an algebraic expression? Whiteboard exercise Play

What is an algebraic expression? Student activity Play

When is a number divisible by 2, 4, 5, 10? Animation Play