Curriculum Topics Covered
Square numbers, proof - algebraic and visual, being systematic.
Can your students investigate the sorts of numbers that can be the difference of two squares, before watching the video? 'Difference of Two Squares' is a task we've made that you could use for this. See 'Differences of Two Squares Notes' for teacher notes on this task. Also, see this similar Nrich task: https://nrich.maths.org/742
In the video, Matt and James do not do a visual proof that all multiples of four can be written as the difference of two squares. Can your students find a way of doing this? See our proof in the document: 'Proof Multiples of Four'.