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Triangular Numbers

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Maths Learning (Numbers) Note on Triangular Numbers, created by simon.shah on 05/10/2013.
simon.shah
Note by simon.shah, updated more than 1 year ago
simon.shah
Created by simon.shah about 11 years ago
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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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