The common factor is 3. (105 = 35 x 3, 12 = 4 x 3).
The least common denominator is 420.
105 = 3 x 5 x 7
12 = 22 x 3
Highest exponents method: 22 x 31 x 51 x 71 = 420
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105
The Greatest Common Divisor/Denominator is 21
The Greatest Common Divisor/Denominator is 35
The highest common denominator is 12 because 12/12=1 and 24/12=2.
The least common denominator for 12 and 16 is 48.