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If each stepping stone is 12 x 12, you would need 420.

If not, multiply the dimensions and divide them by 144. Then divide 420 by that number.

For example,

If the stones are 18 by 18.

18 x 18 = 324

324 ÷ 144 = 2.25

420 ÷ 2.25 = 186.7

Always round up and you get 187 stones of a size of 18 by 18.

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13y ago

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