Watch this video. Every time you feel you are confused, just pause and rewind the video and rewatch it. Do this until the video makes sense.
Can't do it can you? It doesn't matter how much you pause and rewind a video, if it doesn't make any sense to you, watching it again isn't going to suddenly change the video so it makes sense.
One critical job of the teacher is to find out where students are, and help them at that stage. Explanations that don't make any sense aren't particularly helpful. In fact, since our goal is to help students learn the mathematics, and not just the words that represent the mathematics, explanations may not be helpful at all.
David is a Formative Assessment Specialist for Mathematics at New Visions for Public Schools in NYC. He has been teaching since 2002, and has worked in Brooklyn, London, Bangkok, and Vancouver before moving back to the United States. He has his Masters degree in Educational Technology from UBC, and is the co-author of a mathematics textbook. He has been published in ISTE's Leading and Learning, Educational Technology Solutions, The Software Developers Journal, The Bangkok Post and Edutopia. He blogs with the Cooperative Catalyst, and is the Assessment group facilitator for Edutopia. He has also helped organize the first Edcamp in Canada, and TEDxKIDS@BC.