[tex]1)\\\\Identify \ common \ factor : \\\\ 12= \ \boxed{2} \cdot 2 \cdot \boxed{3}\\\\18= \boxed{2} \cdot \boxed{3}\cdot 3\\\\Multiply \ the \ common \ factor : \ 2 \cdot 3 =6 \\ \\ Answer: \ The \ GCF \ of \ 12 \ and \ 18 \ is \ 6 .[/tex]
[tex]2)\\\\Identify \ common \ factor : \\\\ 10= \ 2\cdot \boxed{5} \\\\15=3\cdot \boxed{5}\\\\25= \boxed{5} \cdot 5 \\ \\ Answer: \ The \ GCF \ of \ 10 \ and \ 15 \ and 25 \ is \ 5 .[/tex]
[tex]3)\\\\Identify \ common \ factor : \\\\ 27= \ \boxed{3} \cdot3 \cdot 3\\\\42=2\cdot \boxed{3}\cdot 7 \\ \\ Answer: \ The \ GCF \ of \ 27 \ and \ 42 \ is \ 3 .[/tex]
