This video is probably one of the most important for the whole Mathematics curriculum. Negative numbers are used in every subject and topic. Being about to add and subtract negative numbers is going to be vitally important. Sadly, it's something which people find challenging! But ... hopefully not once you've watched this video. Addition and Subtraction of negative numbers can be done using "The Four Rules" which I show (with lots of examples). I also show why they work. All explained without the smoke and mirrors!