Using 6 as the highest common factor for both numbers:
18/42 = 3/7
18/42 = 3/7 in its simplest form
18/42 = 3/7
18/42 = 3/7
24/56 and 18/42 both equal 3/7 in their simplest forms.
3/7
18/42 = 9/21 = 3/7
18/24 = 0.750.75 = 3/4
3/7
Three over seven is the lowest reduction.
18/42 = 9/21 = 3/7 (0.428571 recurring)
18/42 = 9/21 = 3/7 so divide both by 2 then by 3
18/42 = 3/7