Yes. Look for common factors between the two numbers, then divide both numbers by the common factor.
It is: 3/5 simplified
45/1200 = 3/80
30/45 = 2/3
330/45 = 22/3.
2/3
It is: 3/5 simplified
15/45 is 1/3 when simplified
15/45 = 1/3
45/105 simplifies to 3/7.
It is: 15/45 = 1/3 simplified
5/3
53/45 cannot be simplified further.