Dr Simon Singh, author of the No. 1 bestseller Fermat’s Last Theorem and The Simpsons and Their Mathematical Secrets has created a set of weekly maths challenges – roughly 30 minutes of interesting, fun and challenging material that goes beyond school maths: mystery and history, activities and oddities, puzzles and problems: www.parallel.org.uk
This site is aimed at ages 10-14 and offers each week a puzzle sheet for 10-12 years and one for 12-14 years – it is a mix of maths, videos, puzzle, etc.
It is marked automatically and teachers can create accounts so that they can see how their students are doing. If you know people who might be interested in NL and Belgium, then please spread the word.