“Fifteen” is a word used to represent the number 15, which is a positive integer that follows 14 and precedes 16 in the natural number sequence.
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The word “fifteen” is composed of two parts: “five” and “-teen”. The first part, “five,” refers to the quantity of five, which is multiplied by three to obtain the number 15. The second part, “-teen,” is a suffix used to form the numbers from 13 to 19. The origin of the word “-teen” can be traced back to the Old English word “tīen,” which means “ten.”
Therefore, when the suffix “-teen” is added to “five,” it creates the word “fifteen,” which can be defined as “the number equivalent to the sum of five and ten.”
In mathematical notation, 15 can be expressed as the product of 3 and 5, which is represented as 3 x 5 = 15. Additionally, 15 is an odd number, which means that it is not divisible by 2 without a remainder.
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In terms of its use in everyday language, “fifteen” is often used to indicate quantities of items or to represent a specific age. For example, “I have fifteen apples” or “She turned fifteen last week.”
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