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Triangular Numbers

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Maths Learning (Numbers) Notas sobre Triangular Numbers, criado por simon.shah em 05-10-2013.
simon.shah
Notas por simon.shah, atualizado more than 1 year ago
simon.shah
Criado por simon.shah mais de 11 anos atrás
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There is a really easy way to work out how many dots in a specific sequenceWe know the 4th sequence has 10 dotsTake 4 and multiply or by 4+1, or 54 x 5 = 20Then half that numberSo 20/2 = 10Very cool :-)

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