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It's part of the identity property. Pick a number. Multiply it by one. The answer will be the number. That means that every number has the factor pair of itself and 1, so every number has one as a common factor.
Answer is one.
1 is a factor of every whole number, and the gcf of two numbers can be 1 if there is no larger factor common to both numbers.
Because every [whole] number can be divided by '1' without a remainder. ' 1 ' fits into every [whole] number a whole number of times.
No, 1 is a factor of every whole number because 1 is a factor of every whole number.