Factors and multiples are the building blocks of Number Theory. Try these problems and games and get to grips with the underlying structure of our number system.

Can you be the first to hit 23? Play the game and see if you can come up with a winning strategy.

Each number must be a factor or multiple of the last. What's the longest chain you can make?

Mastered Got It? Then see where to go next!

Watch this talk by Dr Vicky Neale as she explores some equations, and covers some highlights from the rich history of number theory along the way.