Given the sum 18 = 6 + 12, rewrite 6 + 12 using their GCF and multiplication.
A: 3 (2 + 4)
B: 6 (1 + 2)
C: 6 (1 * 2)
D: 1 (6 + 12)
The greatest common factor (GCF) of 6 and 12 is 6.
So, the sum 6 + 12 can be rewritten as 6 * (1 + 2).
Therefore, the correct answer is C: 6 (1 * 2).