Even though the word "number" has no "o" in it, the abbreviation is No. because it is based on the Latin word numero (which is also Spanish for number).
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"No" represents the Latin word 'numero', which is related to "numerus", which is the word for number.
It is likely that the word number is abbreviated as "no" because of its Latin origins. Many words are spelled or abbreviated by the origins, rather than the current spelling of the word.
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A prime number has two factors, a composite number has more than two.
mixed number is a whole number plus a fraction
The number of days is plural. The number of the day is singular.
the number of pages in the book I Am Number is 420Four