Correct spelling, explanation: the correct form fifteen is derived from Old English fīftēne, where fīf meant five and -tēne indicated ten. Together, the word represented five plus ten, or fifteen. English numbers ending in -teen (like thirteen, fourteen, fifteen) have their roots in indicating a base number plus ten. The -teen suffix is a key part of their structure. Fiften would break the pattern shared by numbers like thirteen, fourteen, sixteen, etc.

Definition of fifteen:
Number, equivalent to the product of three and five; one more than fourteen, or five more than ten
Sarah invited fifteen friends to her birthday party, and they all showed up with gifts.
It took me exactly fifteen minutes to walk from my house to the coffee shop.

Collocations with fifteen:
Some of the most commonly used collocations include:
1. Fifteen minutes: a quarter of an hour; a common time interval in daily activities.
The meeting was scheduled to last only fifteen minutes, but it went on for an hour.
2. Fifteen years: used to refer to a specific age or a period of time spanning 15 years.
She started her career fifteen years ago and is now a top executive.
3. Fifteen percent: a fraction equal to 15 parts out of 100; often used in finance, discounts, or statistics.
The store is offering a fifteen percent discount on all electronics this weekend.
4. Fifteen people: referring to a specific number of individuals.
Only fifteen people attended the seminar despite extensive promotions.

Incorrect spelling, explanation: the form fiften is incorrect because it is simply a misspelling of the correct word fifteen. The word fifteen comes from the Old English fīftēne (literally five-ten). Dropping the second -e in fifteen would obscure this linguistic pattern and break the convention seen in other numbers ending in -teen. The suffix -teen is necessary for indicating numbers between 13 and 19 in English (thirteen, fourteen, fifteen, etc.). The -teen part is essential to maintain clarity and consistency.

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