About.com says that a standard roll of coins has 50 dimes, which are worth $5. A half roll of dimes has 25 dimes, which are worth $2.50. A double roll of dimes has 100 dimes, which are worth $10.
A shotgun roll is another name for a regular roll. Like dimes, 50 pennies fit in a roll, but a roll of pennies is worth 50 cents instead of one dollar. For $2, you can buy a roll of 40 nickels. For $10, you can buy a roll of 40 quarters. Twenty half-dollar coins fit into a roll, which is worth $10.
