Numbered trees
Consider each pair
Adjacent sums
Must be square
Topics: Starter  Arithmetic  Number  Problem Solving  Puzzles
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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=March20 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.
Transum.org/go/?Start=January8
Here is the URL which will take them to another activity involving square numbers.
Here is the URL which will take them to the interactive version of this activity called Square Pairs Game
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