Number pyramid – adding – Crick

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Interactive to explore totals at top when numbers at bottom are changed. Investigative. KS2

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<embed><a href='http://mathszone.co.uk/calculating/mental-addition/number-pyramid-adding-crick/' target='_blank'><h3>Number pyramid – adding – Crick</h3><img src='http://mathszone.co.uk/wp-content/uploads/thumb53.jpg' width='100%' style='max-width:300px;'></a></embed>