Use 1 inch margins or larger. Q. I'm editing a book that follows Chicago's general rule for spelling out numbers zero through one hundred.Everything you need to know to create a Chicago Manual of Style format paper including Chicagostyle citations, with examples. Chicago's general rule: "Chicago advises spelling out whole numbers from zero through one hundred and certain round multiples of those numbers." Decimals are always written as numerals for clarity and accuracy. To revisit our library example, perhaps circulation statistics improved in 2015. Rule: Replace a decimal point with and when you write out amounts on a check. You may use numerals in fraction form for cents. Citing a letter, memo, or other correspondence ; A letter in a print (book) collection ; Note. 2. The word "and" is only correctly used to replace the decimal point as in 3.14, which would be three and fourteenhundredths.