One is a factor of any number, because any number can be evenly divided by one.
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Because any number times one equals the original number. Therefore, one and the number itself will always be a factor pair of any given number.
One
One.
the number 10 is a factor of any number that ends with zero
Because 3 is a factor of 9. Any number that has a composite number as a factor will also have that number's factors as factors.