5/13*39=5*3=15;
5*2 1/5=5*11/5=11;
3 3/5*1 1/9=18/5*10/9=4;
4 2/7*2 = 30/7*2=60/7;
2 14/15*6 6/11=44/15*72/11=96/5;
2 2/25 * 1 9/16=52/25*25/16=13/4;
13/43* 8 7/26=13/43*215/26=5/2
27 5/6 * 3 = 167/6 * 3=167/2 = 83 1/2
27 5/6 * 1 1/4=167/6 * 5/4 = 835/24=34 19/24
27 5/6 * 2/3=167/6*2/3 = 167/9 = 18 5/9