4/50 in lowest form
4/50 = 2/25 2 divide into 4 is 2 and 2 into 50 is 25= 2/25 in its lowest form.
you want try find what number can divide to 4 and 50 the only that can divide to both are 2 when you divide 4 and 2 you got a and when you divide 50 and 2 you will get 25 and you will get this 2/25