Triangular cards – A Blundred

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Covered corners hide N + N = N or N x N =N. Uncover one and guess, uncover a second and predict.

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<embed><a href='http://mathszone.co.uk/data-handling/prediction-and-probability/triangular-cards-a-blundred/' target='_blank'><h3>Triangular cards – A Blundred</h3><img src='http://mathszone.co.uk/wp-content/uploads/thumbimg444q.jpg' width='100%' style='max-width:300px;'></a></embed>