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12 x 3 / 4 = 9 The stack is 9 inches high.
20 dimes
The British One Pound coin is 3.15mm thick, so 317 or 318 coins should make a metre high stack.
According to the US Mint, the quarter dollar is 1.75mm thick.1.75mm x 1cm/10mm = 0.175cmSave0.175cm x 1in/2.54cm = 0.0689in1in/0.0689in = 14.5 quarters to make a stack 1 in highObviously you can't stack 14.5 quarters. 15 quarters makes a stack 1.03in high. 14 quarters make a stack 0.965in high.
12 x 3 / 4 = 9 The stack of 12 boards would be 9 inches high.