42 and 66 have the greatest common divisor of 6, so you can divide both factors by 6 to get 7/11.
It is already in its simplest form.
24 over 66 in simplest form is: (24 รท 6)/(66 รท 6) = 4/11
It is: 46/66 = 23/33
It is: 88/66 = 4/3
11/66 = 1/6
46/66 = 23/33
18/66 = 3/11
33/66 = 1/2
17 over 33
5 over 6
5 over 11
It is: 66/99 = 2/3 simplified