1) 3/8, 5/12 = 9/24, 10/24 2) 2/15, 3/10 = 4/30, 9/30 3) 10/17, 13/34 = 20/34, 13/34 4) 4/13, 3/4 = 16/52, 39/52 5) 1/9, 1/7 = 6/54, 8/54 6) 9/14, 2/21 = 27/42, 4/42 7) 1/20, 1/30 = 3/60, 2/60