How many dollars is 40000 pennies?

If you had 40000 US pennies, it would mean you have the equivalent $400 US dollars.

This can be solved by taking 40000 and multiplying it by .01

A more interesting question is how much would all those pennies weigh?

To fill a roll of pennies takes 50 coins, and a roll of pennies equals 50 cents. Each roll of pennies weighs roughly .31 pounds. Therefore 40000 pennies would weigh roughly 248 pounds, that is a lot of weight to carry around in coinage when it could all be replaced by four $100 bills and fit easily in your pocket.