From the US Mint's website: a penny is 1.55 mm thick and 19.05 mm in diameter.
So if you stack 100 of them, the 'length' of the stack will be 155 mm (6.1 inches). If you lay them flat, touching, then it would stretch as long as 1905 mm (75 inches - just over 6 feet).
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100 pennies = 100 [pennies].
100 pennies is centimeters is 15
100
100*100= 10,000 pennies
There are 100 pennies in 1 dollar.Therefore: 100 ÷ 4 = 25 pennies.