Question 876071
I'll do the first one to get you started



{{{18/24}}}



{{{(2*3*3)/(2*2*2*3)}}} Factor each number as much as possible (ie do a prime factorization of each)



{{{(highlight(2)*3*3)/(highlight(2)*2*2*3)}}}



{{{(cross(2)*3*3)/(cross(2)*2*2*3)}}}



{{{(3*3)/(2*2*3)}}}



{{{(highlight(3)*3)/(2*2*highlight(3))}}}



{{{(cross(3)*3)/(2*2*cross(3))}}}



{{{3/(2*2)}}}



{{{3/4}}}



=======================================================



So, {{{18/24=3/4}}}