Originally Posted by matty-hodgson 
why do they call them 21:9 and 16:10 when they aren't the lowest ratios?
i always thought when you talked about ratios you used the lowest values?
7:3 and 8:5 respectively
For once trying to help joe public I think. It gives you an idea of the relative ratios, so 16:9 compared to 16:10 you get the idea that the latter has a longer height, compare 16:9 to 8:5 and it not immediate what the difference is.