The Guardian – Alex Bellos
“Today you are pitting yourselves against the best 13-year-old mathematicians in the UK. The questions below are taken from last week’s Junior Mathematical Olympiad, a competition aimed at children up to Year 8 (in England) who score in roughly the top half per cent of mathematical ability. The competition is a two hour paper, split into two sections. I’ve chosen three questions from the more challenging section, presented in increasing level of difficulty.” (more)