In order to do that, you need to change it all into the same denominator. The denominator would be 12. 3/4 is 9/12; 2/3 is 8/12; 1/2 is 6/12; and 1/4 is 3/12. From least to greatest, since all the fractions now have the same denominators, you look at the top numbers and decide. 3 is the less, the comes 6, 8, and 9. Your answer would be 1/4, 1/2, 2/3, and 3/4.