This is a resource I have created for Pi Day 14/03/13. I have taken inspiration from the popluar app '4 pics 1 word&' and from the likes of @reflectivemaths, @srcav and @El_Timbre on Twitter. I use the resource with mini whiteboards to get students to write the word and the definition of it. Diff by hiding/revealing the letters to choose from. see http://mrcollinsmaths.blogspot.co.uk for more info.