Comedy adventure series aimed at four- and five-year-olds in which animated numbers solve mathematical problems in the real world, with input from real children. Numbers 3 and 4 are watching TV and bickering about who could move up to give the other more space, when they are interrupted by the Agent's alarm. There is a problem with sizes. Things are either tiny or huge. It is decided that 4 should take on the mission. The Numberjacks learn that it is important to be exact when it comes to sizes.