Today, we are going to add a new word to our Math's Vocabulary. The word 'perimeter' means the total length around a shape. Try saying the word 'perimeter' out loud, can you try to use it in today's session when discussing it with an adult? In order to find the total perimeter of a shape, we need to work out the length of each side, and add these together to get a combined total. Use today's video as an introduction, and have a go at some of the activities before selecting a challenge from below.