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I am writing an assignment, and I need to say, "6", "year","old", and "girl". I wrote 6 year old girl, but I keep getting a blue underline suggesting it is grammatically incorrect. How should I be writing this, and why?

Trina
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It should be a six year old girl as six is a small number. There are certain rules as to when you can use a numeral vs spelling. As a general thumb rule, use spellings for the numbers one to one hundred, one to ten, any word that can be written with one or two words, and so on. Note that these rules are not etched in stone.

Please check this reference: Grammar Girl

Compound modifier 'six year old' modifies the noun 'girl'. So, some text processors like Word hyphenate the compound modifier. So you can try, 'six-year-old'