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, …

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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.

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 …

(Definition of nine from the Cambridge Academic Content Dictionary © Cambridge University Press)

Dec 29, 2025 · Numeral nine A numerical value equal to 9; the number following eight and preceding ten.

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.

9 is a number, numeral, and glyph. 9 or nine may also refer to: Search for "9" or "nine" on Wikipedia.

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