The fraction 51/80 is equal to 63.75% when converted to a percentage. This means that 51 out of 80 parts represent about 64% of the whole. It's a bit more than half, but not quite two-thirds of the total.
In everyday situations, you might come across this fraction or percentage in various contexts. For example, if 51 out of 80 students passed a test, you could say that 63.75% of the class succeeded. Or if you completed 51 pages of an 80-page book, you'd be about 64% done with your reading. This percentage is useful for understanding proportions and comparing different quantities in relation to a whole.