The least common multiples of 7 and 14 are 14,28 and 42>
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There is an infinite number of common multiples for 7 and 14. A common multiple of any two or more numbers is any number into which each of two or more numbers can be divided evenly (zero remainder).
140,280,420
The least common multiple of 7, 14, 21 and 36 is: 252
As 84 = 14 x 6: All the factors of 14 are common to both, ie the common factors of 14 and 84 are: 1, 2, 7, 14; All the multiples of 84 are common to both 14 and 84, ie the common multiples of 14 and 84 are: 84, 168, 252, 336, 420, 504, 588, 672, 756, 840, ...
The common denominator is 28.