Only one whole number goes into one: 1
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These are all the whole numbers that go into 1,284 evenly: 1, 2, 3, 4, 6, 12, 107, 214, 321, 428, 642, 1284.
Called 'factors', the positive whole numbers that go into 201 evenly are: 1, 3, 67, 201.
All factors are whole numbers and all whole numbers are rational numbers (a rational number is one which can be expressed as one integer over another integer, and whole numbers can be expressed as themselves over 1), thus all factors are rational numbers and so all greatest common factors are rational numbers. The set of whole numbers is a [proper] subset of the set of rational numbers: ℤ ⊂ ℚ
It is not possible to express something as a sum of whole numbers with no common factor. All whole numbers have at least 1 as a common factor.
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