Question: There are fifty states in the United States of America. If three-fourths (3/4ths) are required to vote in favor of an amendment in order for it to be added to the Constitution, how many states is that? Make sure to round up to the nearest state. In other words, if your calculations gave you 16.2 states, you'd round up to 17 (since you cannot have 0.2 states voting in favor of something).