How to write numbers in a formal English text:
The decimal point in English
One special problem area for Norwegians learning to write numerals in English is the decimal point. In English the decimal point is “.”. As we have mentioned, the comma is used to mark thousands, as in 7,100 (seven thousand one hundred). If, for example, your new bicycle costs, seven thousand one hundred and 23 dollars and fifty cents, this would be written as $ 7,123.50.
When referring to percentages, English also uses “.”. For example: In Norway, 73.5 per cent of all inhabitants like snow. Notice how we have started with the prepositional phrase “In Norway”. One of the reasons we have done this is because, as mentioned above, in formal English one should avoid starting a sentence with a numeral, unless you write it out in full. This includes percentages. Thus:
Seventy-three per cent of all Norwegians like snow.
A total of 73 per cent of Norwegians like snow / In Norway, 73.5 per cent of all inhabitants like snow.