There are **50 dimes** in 5 dollars.

Here's the breakdown:

* One dollar is equal to 100 cents.

* Therefore, 5 dollars is equal to 5 * 100 cents = 500 cents.

* Since a dime is worth 10 cents, you can divide the total number of cents (500) by the value of a dime (10 cents/dime) to find the number of dimes: 500 cents / 10 cents/dime = 50 dimes.