In American English a period ( . ) is used as a decimal separator, but there are other places in the world where a comma ( , ) is used.
I would read a quantity of 7.5 as “seven point five” written as-is. But if you use a pause and not a point how do you read the number aloud?
On ukraininan its “Сім цілих п’ять десятих”, or “Seven whole (and) five tenths”. If the decimal is 5, then you just say “Сім з половиною”, or “seven and a half”. Whether comma or period is used, it does not matter.