Eleven (11) is the natural number following 10 and preceding 12. It is a prime number, the first two-digit prime number, and holds various cultural and mathematical significance. Key Facts About 11
Definition: The cardinal number that is the sum of ten and one.
Mathematics: It is a prime number, a repunit (11 = 10¹ + 10⁰), and the first number in the decimal system that requires two digits to be written. Idioms & Phrases:
“Up to eleven”: A phrase popularized by This Is Spinal Tap to mean exceeding typical limits.
“The eleventh hour”: Refers to the last possible moment or a time of urgent danger (e.g., in the context of the Doomsday Clock). Cultural Significance:
Eleventh Night: Bonfires lit in Northern Ireland to mark the eve of William III’s victory at the Battle of the Boyne. This video teaches the multiplication table for 11:
If you had a specific question about the number 11, please let me know!
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