# How should I hyphen decimal numbers written in letters (that contains the word "point" and "and")?

All the wesites I've looked at says to hyphen numbers when you are describing compound numbers between 21 and 99 (except 30, 40, 50, 60, 70, 80 and 90). A compound number is any number that consists of two words; for example, eighty-eight, twenty-two, forty-nine. Numbers higher than 99 do not need a hyphen.

But the problem is that none tells me what happens when we encounter decimal numbers.

How should I hyphen these numbers that contain "point" and "and"?

• three(-)and(-)a(-)half.

• three(-)point(-)five.

• five(-)hundred(-)and(-)thirty(-)six(-)and a half.

• five(-)hundred(-)and(-)thirty(-)six(-)point(-)five.

Can someone perhaps provide me a link that explains this?

• This question has some suggestions e.g. "one and three-quarters" (see also Chicago), although rules are not very firm. Writing decimals in words is so horrendous that no style guide seems to cover it. Rather than "three point five" write "three and a half". Commented Jun 30, 2022 at 13:31
• Decimals are not usually written in letters; they are written as decimals. Only in some legal documents, will they be written out. For example: Party X will receive a 5.5% (five and a half percent) commission on all sales. Commented Jun 30, 2022 at 13:52