http://illuminations.nctm.org/assets/0/77/77570ffc-98f8-46b5-b4d1-aa8043e88c49.swf - 0 views
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Martin Burrett on 27 Dec 13This is a wonderful resource for teaching the area of 2D shapes. Move and resize the shapes to change the values. It's a great resource to use on an interactive whiteboard. http://ictmagic.wikispaces.com/Maths