1/4 + 5/6 = 3/12+10/123/12 + 10/123/12+10/12 = 13/12
2/9 + 1/6 = 4/18+3/184/18 + 3/184/18+3/18 = 7/18
1/4 + 5/6 = 3/12+10/123/12 + 10/123/12+10/12 = 13/12
2/9 + 1/6 = 4/18+3/184/18 + 3/184/18+3/18 = 7/18