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'Consecutive Squares' printed from http://nrich.maths.org/
A discussion may be needed on how to represent the eight
Students may square and add terms in an almost random way to start
with and it is worth giving them time to play before disucssing
what might be a more efiicient method.
Rather than squaring terms on a need-to-know basis - how about
suggesting working them all out to save time re-calculating
expansions as needed.