I have come across the following three spoken variants for the fraction ⅞:
- Seven by eight
- Seven over eight
- Seven into eight
I am also aware of seven-eighths but I don't want to use that as it isn't practical for larger numbers. As an Indian, the most common variant I have heard is the first one but somehow that doesn't seem right. Besides, since English isn't our native language, I wouldn't want to trust it. I want to know from native speakers what they use and what's the correct way to refer to such numbers.
To make things even more complicated, most Indians use the third variant to mean something like 7×8, which I guess should be more appropriately referred to as seven times eight.