#{:
("Prime factors of "12ab,color(white)("XX"),2,2,3,,a,b),
("Prime factors of "18b,,ul(2),ul(color(white)2),ul(3),ul(3),ul(color(white)a),ul(b)),
("Common prime factors",,color(red)2,color(white)(2),color(red)3,,,color(red)b)
:}#
#GCF ("Greatest Common Factor") = "product of common prime factors"#
#color(white)("XXX")=color(red)2xxcolor(red)3xxcolor(red)b#
#color(white)("XXX")=color(red)(6b)#