Write down two consecutive numbers.
Square each of them and find the difference.
Do the same for other pairs of consecutive numbers.
What do you notice?
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Teacher, do your students have access to computers such as tablets, iPads or Laptops? This page was really designed for projection on a whiteboard but if you really want the students to have access to it here is a concise URL for a version of this page without the comments: Transum.org/go/?Start=October10 However it would be better to assign one of the student interactive activities below. 

Here is the URL which will take them to another activity involving square numbers.
See the National Curriculum page for links to related online activities and resources.