One of the things I always try to identify at the beginning of a new semester are those students for whom maths is a chore; those students who dislike or even hate math; those students who misguidedly say they are no good at math. Recent research, especially in the area of Carol Dweck's Mindset Theory suggests that the way we feel about ourselves in relation to maths directly affects our ability to learn maths. Very often, this negative self concept is something engendered by the actions of an uncaring or thoughtless teacher or a bad experience many years ago. Very often it is not a person's fault that they think they are no good at maths and there is absolutely no reason in the world that any adult can continue to not understand maths.
One of the things I always try to do in the first class is to give students examples of how exciting and interesting it is to teach maths to young children One of the stories I always tell is of a kindergartner I once met several years ago who was convinced that 6 subtract 6 was five. Nothing we could say would convince him otherwise, so finally we asked him to show us with his fingers. He put up five fingers on his left had, pointed to each one with his right index finger and counted them out loud; "1,2,3,4,5". He then put up his thumb on his right hand and said "6", touching it with his nose. He then said, while removing his right thumb, "OK, now I take away 6 and I've got 5 left".
According to the cognitive level of development of his numeracy skills he was absolutely right of course. He was in that halfway place of moving from the nominal or naming use of number to the cardinal or counting use of number; something we all go through in our early years. He was fine with 5 because that's an easy one, a handful, but was still working on the other single digit numbers such as 6.
Learning about how children lean maths is the best thing in the world. I have also decided to use "maths" instead of "math" all the time. "Mathematics" is a plural; so too should be the abbreviation.