The GCF is 84.
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The GCF is 48.
The GCF is 14.
The common multiples of 21 and 28 are 84, 168, 252, 336, ... and so on, never ending; so there is no real Highest Common Multiple.Do you mean:Highest Common Factor - the highest number which divides both 21 and 28 which is 7; orLowest Common Multiple - the lowest number which is a multiple of both 21 and 28 which is 84.
Since 24 is a factor of 336, it is automatically the GCF.
The least common multiple of 12 , 16 , 14 = 336