перевести дроби в десятичные:
13/2; 7/2; 51/2; 43/2; 14/5; 7/5; 21/5; 4_11/20; 11_3/20; 9/25; 4_21/25; 3_3/4; 13/50​

13/2 = 6,5
7/2 = 3,5
51/2 = 25,5
43/2 = 21,5
14/5 = 2,8
7/5 = 1,4
21/5 = 4,2
4_11/20 = 4,55
11_3/20 = 11,15
9/25 = 0,36
4_21/25 = 4,84
3_3/4 = 3,75
13/50 = 0,26