Preschool adventure series. Animated numbers solve mathematical problems in the real world, with help from children. The Problem Blob is making fours go wonky all over the place, and when Four goes to sort it out he ends up being slimed and swapping places with a man in a restaurant. The new numberjack, Numberjackman, gets into trouble as he is a bit big to be a numberjack. They decide to swap the Blob with something very far away.