document: 11 July 2017 Last updated at 15:55 BST
  On the tiny island of Muck in Scotland there's only one school with just 9 pupils!
  Muck measures just 2.5 miles from east to west and has a population of around 27 people.
  Whitney went to spend a day at the island school...
summary: What's it like to have your whole school in just one class?