Let a, b and c be the pear numbers.
a + b is a square number
b + c is a square number
c + a is a square number
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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:
However it would be better to assign one of the student interactive activities below.
Here is the URL which will take them to a similar activity.
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.