Arrange the numbers on the yellow tiles so that the sum of the numbers in the vertical line is the same as the sum of the numbers in the horizontal line
How many different ways are there of doing this task?
A selfchecking, interactive version of this activity with 30 different puzzles is
here.
Answers
Here are all of the 36 possible solutions.
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Teacher, do your students have
access to computers? Do they have iPads or Laptops in Lessons?
Whether your students each have a TabletPC, a Surface or a Mac,
this activity lends itself to eLearning (Engaged Learning). 

Here a concise URL for a version of this page without the comments.
Transum.org/go/?Start=February3
Here is the URL which will take them to a related student activity.
Transum.org/go/?to=plane