`And you do Addition?' the White Queen asked. `What's one and one and one and one and one and one and one and one and one and one?' `I don't know,' said Alice. `I lost count.' `She can't do Addition,' the Red Queen interrupted. `Can you do Subtraction? Take nine from eight.' `Nine from eight I can't, you know,' Alice replied very readily: `but -- ' `She can't do Subtraction,' said the White Queen.

(Lewis Carrol - Through the Looking-Glass and What Alice Found There)

The novelist Lewis Carrol was also a mathematician and inserted many maths references in his masterpiece ”Alice in Wonderland” and in his other literary works.

Did you know that ”4x5” can equal 12? Alice finds this unusual evidence in the second chapter of the book, called ”The Pool of tears”. Alice's Strange Multiplicationis not impossible, but can be done using a number different from ten as a basis of the numbering system.

Alice’s example has been a real inspiration for our students who have been challenged to invent and solve new maths games: the students from Bucarest have proposed a puzzle to their Italian partners, and these ones have published the solution in our blog!