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Topic : Re: Spell out numbers before times, days, months? The general rule I follow is to spell out numbers < 10. Also when use numbers before measurement I don't spell out. For example: I bought nine - selfpublishingguru.com

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This depends on your style guide. If you're following APA, all of your examples look good to me. My reasoning:

I bought nine apples: The number is under 10 and no special rules apply.
We need 5 mL acid for this reaction: It is written before a "unit of measurement", so it is written as a number.

Jack, you already did it three times!: The number is under 10 and no special rules apply.
It has been five months since she left me: This looks like an "approximate unit[] of time", so it's written as a word.

Here's what APA says:

Use numbers to express:

a. numbers 10 and above
b. numbers in the abstract of a paper or in a graphical display within a paper
c. numbers that immediately precede a unit of measurement
d. numbers that represent statistical or mathematical functions, fractional or decimal quantities, percentages, ratios, and percentiles and quartiles
e. numbers that represent time[*], dates, ages, scores and points on a scale, exact sums of money
f. numbers that denote a specific place in a numbered series, parts of books and tables, and each number in a list of four or more numbers

Use words to express:

a. any number that begins a sentence, title, or test heading
b. common fractions [one-fifth of the class; two-thirds majority]
c. universally accepted usage [the Twelve Apostles; Five Pillars of Islam]

(I got this list from here, which unfortunately forces you to download it.)

[*] The APA Blog clarifies here that for "approximate units of time" you should use words.


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