As the world puzzles over Cheryl's birthday, we take a look back at the hardest spelling, grammar, maths and logic questions we've published. Can you answer them?
The mutilated chessboard is a classic puzzle. But can you square up a solution to the other problem?
As a survey reveals that a third of adults want to improve their maths, Florence Cook takes a look at the curriculum. Take our quiz to find out
SHE'S a national treasure with a brain bigger than Britain (probably) but do you think you could beat Carol Vorderman in a maths quiz?
This maths problem was one of many that brought Scottish students to tears and resulted in the pass mark being lowered for their Higher Maths exam.
BBC: Rushed maths leads to 'superficial' learning, ACME report says
These taxing questions will show whether you are a mathematical whiz or a total dunce