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The US mint lists the mass of a clean, current (2012) penny as 2.5 grams.
I'll spare you all the unit conversions and just blurt out the answer.
(Just because I have to do all that work, why should you suffer ? !)
At 2.5 grams per penny, you'd need 182 of them to weigh one pound.
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Earn +20 ptsQ: How many copper pennies does it take to make 1 lb?
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How many new pennies make a pound of copper?
One modern cent weighs 2.5 grams and contains 2.5% copper, which is 0.0625 grams or about 0.000138 lbs of copper per penny. To get one full pound of copper, it would take 7,246 pennies.
How many pennies does it take to make a nickel?
5 pennies
How many pennies does it take to make 1 million?
It takes a million pennies to make a million pennies. It takes one hundred million pennies to make a million dollars.
How many 1982 pennies does it take to make a pound?
100 pennies = 1 pound.
How many pennies does it take to make 1000000?
5,000,000
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