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the highest common factor of the numbers 12, 16 and 18 is 2.
12
If the highest common factor of 120 and 252 is 12 10*12 = 120 21*12 = 252 Then it follows that the highest common factor of CXX and CCLII is XII X*XII = CXX XXI*XII = CCLII
48 and 84's highest common factor is 12.
12