My youngest daughter was SO upset about her math homework. She simply didnt understand the idea of subtracting negitive numbers. She knew how to do it, but was very upset she didnt know why she was doing it. She simply doesnt want to do math unless she knows why it needs to be done a certain way.
So, we sat down and I explained it.
LMBO.... she came back later and said "thank you, I had so much fun doing it I did extra!"