The 99 Club is a series of ‘clubs’ that children work through to practice and secure fluency in key arithmetic skills as they move through the school. They start on the 11 Club, work through to the 99 Club and finally onto the Mind Boggler, competing to beat their own score. Each club has more questions, covers new aspects of mental maths and has a different time limit. To complete a club, the child must complete every question correctly in the time limit. Parents have an opportunity to help their children with the skills learned through each club.