How do you spell 4?
That's right: the word for the number 4 is four, but ten times that is 40, which is spelled forty. How do you spell 4 in letters? The spelling of 4 is “Four.” Do you spell four or 4? Writing Small and Large NumbersA simple rule for using numbers in writing is that small numbers ranging from one to ten (or one to nine, depending on the style guide) should generally be spelled out.