Yes. Divide 12 and 105 by 3. You then get 4 over 35 or 4/35.
2/105 cannot be reduced.
No.
6
50/105 = 10/21
Yes: 1/7
Yes, to 16/35
Yes, 2/35.
105/98 reduces to 15/14. 105/7 = 15 and 98/7 = 14
105/90 = 7/6 or 11/6
1/12 can't be reduced.
105/180 = 21/36 = 7/12
12 over 5 reduced to its lowest term = 12/5 or 22/5