What is the perimeter of this triangle?

Solution revealed: 02 Jul 2021

Freddy the fly is wondering about his chances of landing closest to point B...

Solution revealed: 25 Jun 2021

For which values of n is this expression an integer?

Solution has been revealed

Would you trust this housemate?

When is this expression prime?

It's not just 30-60 and 45-45 right-angled triangles that are special! What about a 15-75 right-angled triangle?

Your challenge is to determine four prime factors of a very large number using just pencil and paper methods.

Can Freddy visit every square on the chessboard?

What is the probability that the eggs and eggcups match?