When writing an academic paper in MLA style any number less than must be written out. Correct example: She purchased thirty-five apples. NOT - She purchased 35 apples.
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Write numbers in words that can be written in one or two words

Explanation:

Modern Language Association (MLA) is a method of writing mostly used in the  United States and is used by persons writing journals, classroom tasks and commercial purposes.

Traditionally, in MLA style numbers are written in words if there are only one or two words. For example: one hundred, five, twenty. But if the number is a decimal, fraction or it takes more than three words to write out then it must be written in numerical format. For example: 101, 28.56 and 2.