Sagot :
get the common primes
28 = 2*2*7
96=2*2*2*2*2*3
their common prime is 2*2 so 4 is their GCF
28 = 2*2*7
96=2*2*2*2*2*3
their common prime is 2*2 so 4 is their GCF
[tex]28|2~~~~~~~~~96|2 \\
14|2~~~~~~~~~48|2 \\
..7|7~~~~~~~~~24|2 \\
~~~~~~~~~~~~~~~.12|2 \\
~~~~~~~~~~~~~~~~~6|2 \\
~~~~~~~~~~~~~~~~~3|3 \\
28=2^2*7 \\
96=2^4*3 \\
^{\underline{~~~~~~~~~~~~~~~~~~~~~~~~~}} \\
G.C.F=2^2 \\
\boxed{G.C.F=4}[/tex]