In the US, we use pennies, nickels, dimes and quarters.
Pennies are zinc, but they are copper plated.
If the pennies were pre-1982 then 9 US pennies are very close to 1 ounce (9.145 pennies = 1 ounce). If the pennies are after 1982 then 11 US pennies are very close to one ounce (11.34 pennies = 1 ounce).
The US never made silver pennies. In 1943 the US made steel pennies. These are often mistaken for silver pennies.
pennies can be best used as such. How many pennies do you have?
For US money-21500 pennies would equal $215. There are 100 pennies to a dollar.
The diameter of a US penny is 0.75inches. There are 256 pennies in a square foot
$750.00 = 75,000 pennies (cents in the US).
There are fifty coins in a roll of US one cent coins, casually called pennies.
35,000 pennies is equivalent to 350 US Dollars. ($1=100 pennies)