If these are kids in the grades 5-8 range, it's not unusual that they are doing problem-solving prep right now. MOEMS contests start in November, and the AMC 8 is in November as well. If you want more than problem-solving at this time of year, you may have better luck looking for a STEM club rather than a math club. Those typically mix things up more and can include building, game playing, puzzle solving, and working with computers for animation or programming.