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cannonballs are stacked in a pyramid shape with a triangular base of 5 cannonballs on a side.How many cannonballs in all are in the stack?
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cannonballs are stacked in a pyramid shape with a triangular base of 5 cannonballs on a side.How many cannonballs in all are in the stack?

User Gaelle
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simply add 5,4,3,2, and 1 together to get 15. each row gets smaller by 1, so simply keep adding until you get to 0.
User Dawid
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