Well, honey, 12 goes into 13 once with a remainder of 1. It's like trying to fit into your skinny jeans after Thanksgiving dinner - it's just not gonna happen without a little extra room. Just remember, math may not always be your friend, but I'm here to make it a little less painful.
Exactly 12 times.
13 can go into 51 three times, with 12 left over.
13 times with 4 remainder.
14.25 times
8.3846 times.
13
13 times.... with a remainder of 9.
7.8667 times.
13 remainder 5
13, remainder 12
1 R 1
It goes: 159/12 = 13 times with a remainder of 3 or as 13.25