It is: 231/165 = 7/5 in its simplest form
165/231 = 5/7
231/1378 is already in its simplest form
165/7 is in its simplest form.
You should say "What is the common factor of 231 and 165?" or "What number is divisible by both 231 and 165?"In that case, the answer is 11.
112/165
No because 165/176 = 15/16 in its simplest form
It is: 231/352 = 21/32 simplified
165/261 = 55/87
75/165 simplifies to 5/11
21/352
21/352
7/11