This is a great way to get pupils collaborating in the classroom and focusing on the steps to solve problems.
Put pupils into groups of four, then distribute four problems. Each pupil solves a step before passing to the left and so on, until each problem has a complete solution.
This works well for simple practise or working on exam technique for longer problems, as it encourages clarity in working out. It also allows lots of time for peer support, so could be done with a pair of higher-attaining and lower-attaining pupils per group.