To do this, you first have to break 84 and 108 down into their prime factors:
84 = 2x2x3x7
108 = 2x2x3x3x3
The next step is to identify any common prime factors. In this case both numbers have two 2s and a 3 as prime factors. Multiply these together and you get 12.
Therefore the HCF of 84 and 108 is 12.
8
HCF(10, 84) = 2 HCF(10, 84) = 2 HCF(10, 84) = 2 HCF(10, 84) = 2
84
hcf = 42, lcm = 84.
The GCF is 28.
Since 12 is a factor of 84, it is automatically the GCF.
The GCF is 7.
124
The GCF is 24.
7
The GCF is 7.
The GCF is 2.
The GCF is 21.