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Use the metric balance to determine the mass of the coins. It is easiest to do this by measuring the mass of more than one coin because you can divide by that number to get the actual mass of 1 coin. This will give you more accuracy with your mass reading.
Example: Mass of 5 nickels = 25.0 g, mass of 1 nickel = 25.0 g / 5 nickels = 5.0 g.
Measure to at least one-tenth of a gram. In other words, if the mass of the coin is around 8 grams, your reading should be 7.9 grams, 8.0 grams, or 8.1 grams.

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