That can't be simplified, since 69 and 20 have no common factors.
It is: 138/20 = 69/10 in its simplest form
69/28 is in its simplest form.
69/100 is already in simplest form.
69 over 87 = 23/29
You can't simplify that; 69 and 50 have no common factor.
69/9 = 23/3
15/69 = 5/23 in its simplest form.
63/69 = 21/23
23 over 15
6.45 = 645/100 = 129/20 or 69/20
16/23
69/250