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'Sorting Letters' printed from http://nrich.maths.org/
can be used to build up children's confidence
with the language associated with describing 2D shapes and their
You can use it as a teacher-led activity, for example by choosing a
particular property and dragging a letter which meets that criteria
to the left of the screen underneath 'These letters are in my set'.
Children can then select other letters in turn and you drag
each one to the appropriate side of the screen. The group has to
work out your 'rule', perhaps using as few letters as possible to
test their ideas. In this way, you can use the same interactivity
to highlight different properties so it can be returned to many
times over the course of an academic year.