I use these sheets for mathex in my junior classroom. They are short the aim is that children will be able to decipher most of the questions themselves. Children work together in teams of three, one as the writer, one as the runner and one as the leader. They work together to solve the problems and run up to the marker after each problem, not being able to move onto the next question until they have successfully completed the one prior. This is a fun way to incorporate problem solving into the classroom and integrate different strands.