This video takes a look at all the language which is needed to be able to cover the rest of the Methods 1 and 2 course. It looks at terms such as set, union, intersection, contained within, in, mutually exclusive and much more. It looks at the ways we can classify numbers including real numbers, rational numbers, integers, and natural numbers. It looks at how we can use interval notation and how we can use this to describe sets of numbers. There is a lot of language, but watching this video will help you succeed in Methods 1 and 2.