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9 is the fourth composite number, and the first odd composite number. 9 is also a refactorable number. [2] Casting out nines is a quick way of testing the calculations of sums, differences, products, and …

Nine is the highest single-digit number in the decimal system. A group of nine is called an ennead. According to Georges Ifrah, [4] the origin of the 9 integers can be traced to the ancient Indian …

The meaning of NINE is a number that is one more than eight. How to use nine in a sentence.

1. a cardinal number, eight plus one.

something representing, represented by, or consisting of nine units, such as a playing card with nine symbols on it

NINE definition: 1. the number 9: 2. describing or relating to work that begins at nine o'clock in the morning and…. Learn more.

something representing, represented by, or consisting of nine units, such as a playing card with nine symbols on it Also: nine o'clock nine hours after noon or midnight: the play starts at nine

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The number nine (9) takes the shape of an upside-down six (6), is a multiple of 3, and the third square number after 4. Nine is also a composite number, having the factors: 1, 3 and 9 itself.