From the US Mint, a penny has a mass of 2.500 grams. There are 28.35 grams in an ounce, so (28.35)/(2.500) = 11.34, so 11 pennies is almost an ounce.
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5 pennies make a nickel.
10,000 pennies make 1,000
5 pennies
3 trillion pennies make 3 trillion pennies. 300 trillion pennies make 3 trillion dollars.
1000 pennies = 1000 pennies. Or what do you want to convert it to?