5x20=100
A roll of 50 cent pieces, which contains 20 coins, weighs approximately 0.25 pounds or 113 grams.
pennies, nickles, dimes, quarters, and fifty cent pieces.
In 1960, Canadian 1 cent pieces ("pennies") were made of bronze, 5 cent pieces ("nickels") were made of nickel, and 10 cent pieces ("dimes"), 25 cent pieces ("quarters"), 50 cent pieces ("half dollars") and dollar coins were all composed of 80% silver (with, I believe, the balance being copper).
A silver fifty cent piece weighs about 12.5 grams.
5 grams
An Australian 50-cent coin weighs 15.55 grams.
A 5 cent coin typically weighs about 5 grams.
One cent (minted 1982-present) weighs 2.5 grams. 50 of them weigh 125 grams.
91% copper
The one cent piece, or penny, weighs about 3 grams. Pennies made between 1944 and 1982 weigh 3.11 grams while pennies made afterwards weigh 2.8 grams.
US one-cent coins manufactured since mid-1982 weigh 2.5 grams, so 200 in unworn condition would weigh a total of 500 grams. Older one-cent coins have different weights; 3.11 grams was the standard from 1946 to mid-1982.