There are **40 nickels** in 2 dollars.

We can find this out by dividing the total value in cents by the value of a single nickel:

Number of nickels = Total value (in cents) / Value of one nickel

1. Convert dollars to cents: $2 x 100 cents/dollar = 200 cents

2. Divide the total cents by the value of a nickel (5 cents): 200 cents / 5 cents/nickel = 40 nickels